When people receive online criticism about eating meat, framing it as a moral failing tends to provoke more defensiveness than framing it as a lack of cooking know-how, according to new research published in Personality and Social Psychology Bulletin. The experiments also suggest that the same moral criticism from a stranger sparks more resistance when it arrives as a private direct message rather than a public comment, possibly because it feels more personally targeted.
Global livestock farming accounts for about 12 percent of greenhouse gas emissions, according to the Food and Agriculture Organization of the United Nations. In light of this environmental impact, a growing number of people have come to view meat consumption as a moral issue rather than a neutral dietary choice. Psychological defensiveness refers to the cognitive and emotional strategies people use to protect their self-image when confronted with unfavorable feedback, such as dismissing the critique or judging the person delivering it negatively.
Past psychological work helps explain why these dietary debates often turn hostile. As indicated by a 2014 study, people evaluate an individual’s character far more by their moral qualities, like trustworthiness and decency, than by practical competence or skills. When people feel morally judged, their defenses tend to spike.
Building on this principle, a 2021 study found that people recalling criticism of their work were more motivated to improve when the criticism targeted their competence rather than their morality, and a study covered by PsyPost in 2021 showed that omnivores often view plant-based eaters as judgmental, which was linked to less willingness to spend time with them.
The research, led by Isaac Chung, a research fellow in the School of Health Sciences at the University of Surrey and an embedded researcher with the Health Determinants Research Collaboration at Surrey County Council, sought to test whether reframing dietary critiques around cooking ability rather than morality would decrease defensive reactions among meat consumers. The authors also wanted to determine whether public critiques provoked more resistance than private feedback, given the potential threat public callouts pose to an individual’s social reputation.
“This study was inspired by the increasing moralization of meat consumption, where eating meat is no longer seen as a morally neutral choice but, at least in some people’s eyes, as something that reflects a person’s moral character,” Chung told PsyPost. “One related phenomenon is the use of ‘meat-shaming’ to prompt people to reduce their meat consumption. However, psychological research suggests that such criticism may backfire, making people defensive rather than motivating them to change. We wanted to test this possibility through experiments and understand why people react defensively, particularly in today’s digital world, where moral criticism can spread rapidly and reach large audiences.”
To evaluate these dynamics, the researchers designed two preregistered experiments using adult meat-eaters residing in the United Kingdom who used at least one social media platform. Both samples were recruited through Prolific and a university participant pool and were predominantly women, making up 73 percent of the first group and 61 percent of the second. In both experiments, participants indicated how frequently they consumed meat, picked a photo of a meat-based dish they might share on social media, and imagined receiving critical online feedback from an unfamiliar person about that post.
In the first experiment, 307 participants were randomly assigned to read either a moral critique or a competence critique. The moral critique accused the participant of not caring about the environment and lacking moral decency, while the competence critique claimed the participant cared but simply lacked the culinary knowledge to prepare plant-based dishes. Participants then rated their reactions on 7-point scales across several dimensions, including perceptions of the critic’s negative motives, personal feelings of offense or insult, derogation of the critic as rude or self-righteous, and intentions to avoid or retaliate against the commenter.
The findings indicated that moral framing heightened defensive reactions across several measures. Perceived negative motive showed the largest difference, averaging 4.82 for the moral critique compared to 3.88 for the competence critique. Derogation was also higher for the moral critique at 5.22 compared to 4.75, while smaller effects emerged for personal feelings of offense (4.95 versus 4.67) and intentions to avoid the commenter (5.02 versus 4.66). The framing did not influence retaliatory intentions, nor did it directly change intentions to reduce meat consumption.
Even the competence critique was often read in moral terms. Participants who received it still rated it as fairly strongly questioning their morality (averaging 5.29 on a 7-point scale, compared with 6.08 for the moral critique), and 73 people in that condition were excluded from the analysis because they did not see the critique as being about cooking skills.
Statistical analyses suggested that defensive reactions were explained in part by perceived moral devaluation, meaning participants felt their underlying character was being questioned. Although moral framing did not directly lower intentions to eat less meat, participants who felt more morally judged reported weaker intentions to cut back.
“Our findings suggest that online criticism of meat consumption may indeed backfire, but not all criticism backfires equally,” Chung explained. “People find criticism suggesting that they eat meat because they do not care about the environment (what we call moral framing) much more threatening and insulting than criticism suggesting that they lack the skills to prepare plant-based meals (what we call competence framing).”
In the second experiment, 316 meat-eaters read the identical morally framed critique, but the researchers manipulated how it was delivered. Half of the participants imagined receiving the feedback as a public comment that anyone could see, while the other half imagined receiving it as a private direct message. The scientists expected public criticism to elicit stronger defensiveness because it placed the recipient’s reputation on display in front of peers.
The outcome contradicted that expectation. Participants who received private messages showed higher levels of defensiveness, scoring higher on personal offense (5.05 versus 4.82) and derogation of the commenter (5.31 versus 5.02). The largest differences appeared in retaliatory intentions, which averaged 3.24 for private messages compared to 2.73 for public comments, and intentions to avoid the commenter, which averaged 4.96 versus 4.40.
Further statistical mediation indicated that private messages from a stranger were perceived as expressing stronger moral condemnation, which in turn predicted weaker intentions to cut down on meat consumption. However, the delivery method did not directly change intentions to eat less meat, nor did it influence perceived negative motives. In addition, the private-message scenario was rated as somewhat less realistic than the public comment, averaging 4.67 compared to 5.37 on a 7-point scale.
“We were surprised to find that privately delivered criticism was perceived as more morally threatening and triggering greater defensiveness than public criticism,” Chung said. “One possibility is that receiving personal criticism from a stranger online makes it harder to dismiss the message as mere moral bragging or virtue signaling, making it feel more directly targeted at oneself. Such unexpectedly personal criticism may also violate people’s expectations about how strangers should communicate online.”
The authors note that this explanation was not directly tested and likely applies to criticism from strangers. When the critic is a friend, they suggest, a public callout might sting more because it violates expectations of mutual support, while a private message might come across as genuine concern.
The researchers also tracked narcissistic rivalry, an antagonistic personality dimension marked by a drive to defend one’s superiority over others. While individuals higher in rivalry generally displayed more hostile and defensive reactions overall, this personality trait did not change how people responded to the different experimental conditions, with one minor exception: lower-rivalry participants viewed private feedback as having a worse motive than public feedback, whereas higher-rivalry participants assumed negative motives regardless of where the critique appeared.
“The effects ranged from small to large when compared with benchmarks based on previous social psychology research,” Chung noted. “Perhaps more importantly, we observed a somewhat consistent pattern across different defensive responses, including putting down the critic as self-righteous or judgmental and wanting to avoid them. Notably, these reactions echo common negative stereotypes of vegans and vegetarians, suggesting that criticism of meat consumption may also deepen tensions between meat eaters and those advocating for reduced meat consumption, something worth considering when promoting dietary change.”
As with all research, there are some caveats to consider. None of the critiques appeared to persuade people. Across all conditions, participants’ average intention to cut back on meat sat below 3 on a 7-point scale, so the competence framing reduced defensiveness without making people more willing to change.
The participants all lived in the United Kingdom, and reactions could look different in countries with other dietary habits and norms around direct communication. The experiments also asked volunteers to imagine responding to hypothetical social media exchanges rather than observing real-time interactions, and the study relied on self-reported feelings rather than tracking actual behavior. Furthermore, the scenario relied solely on written text, leaving out vocal tone or facial expressions that typically shape interpersonal communication.
In the first experiment, once the researchers accounted for how morally judged people felt, the moral critique was actually linked to slightly stronger intentions to eat less meat, hinting that moral appeals can motivate when they do not feel like an attack on one’s character.
“Our findings suggest that criticizing someone’s morality can backfire, but this does not mean morality should be removed from efforts to encourage behavior change,” Chung said. “Previous research has shown that moral appeals can be motivating, suggesting an important distinction: people may be inspired when a behavior offers an opportunity to reinforce their sense of being a good person, but become defensive when moral criticism threatens that sense of self. I have also conducted research showing how moral norms, or beliefs about what people ought to do, can encourage positive health behaviors, such as participating in cancer screening, so I see morality as a powerful motivational tool that we need to learn how to harness effectively.”
Looking ahead, the authors plan to investigate which individuals might be more receptive to environmental messaging and why different people react in distinct ways.
“One direction I would like to explore is why some people respond more constructively to moral criticism than others,” Chung added. “We have found that people with higher levels of narcissistic traits, as understood in personality psychology rather than as a clinical diagnosis, tend to respond more defensively. Conversely, we suspect that people who strongly identify as environmentally conscious may be better able to recognize the moral message behind meat-related criticism without seeing it as an attack on their character. These individual differences could help us understand for whom moral criticism is more likely to backfire and who might be more receptive to it.”
Based on their findings, the authors suggest that messages encouraging people to eat less meat may be better received if they avoid implying that eating meat reflects a moral failing and avoid singling out individuals in a way that feels personally directed.
The study, “Maybe I Can’t Cook, but It Doesn’t Mean I Don’t Care: Moral Framing and Private Criticism of Meat Consumption Leads to Psychological Defensiveness,” was authored by Isaac Chung, Pascale Sophie Russell, and Erica G. Hepper.
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