A propensity for disgust may be tied to tolerance for inequality and xenophobia.
In 2012, a team of academics from Europe and the U.S.—Yoel Inbar, David Pizarro, Ravi Iyer, and Jonathan Haidt—published a paper titled “Disgust Sensitivity, Political Conservatism, and Voting,” looking at the role disgust plays in political orientation. The researchers posited three different types of disgust: interpersonal disgust (i.e., the feeling produced by drinking from the same cup as someone else); core disgust (the response to maggots, vomit, dirty toilets, etc.); and animal-reminder disgust (how we react to corpses, blood, anything that evokes our animal nature).
Disgust, they write, “serves to discourage us from ingesting noxious or dangerous substances,” but also plays a role in moral and social judgments. Those who feel more disgusted by unpleasant images, smells, or tastes judge more harshly that which violates their subjective moral code.
The team had respondents position themselves on a political scale from conservative to liberal. The respondents then stated how strongly they agreed or disagreed with statements like “I never let any part of my body touch the toilet seat in a public washroom,” and rated other hypotheticals according to the level of disgust they generated. Even when controlling for age, education, geography, and religious belief, individuals with higher “disgust sensitivity” were found to be more likely to tolerate wealth inequality, view homosexuality negatively, and place more belief in authoritarian leaders and systems.
Most strikingly, interpersonal disgust was an important predictor of anti-immigrant attitudes. (Source)