Disparaging humour is often about enhancing one's own social identity by positively distinguishing one's in-group from a disparaged out-group.
To understand how this plays out in the context of sexist and anti-gay jokes, researchers from the Western Carolina University in the US conducted two experiments involving 387 heterosexual men.
Participants completed online questionnaires designed to test their social attitudes and personalities, and their prejudice levels and antagonism against gay men and women.
The findings suggest that sexist and anti-gay jokes provide self-affirmation to men who possess more precarious manhood beliefs.
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This is especially the case when they feel that their masculinity, as defined by the typical gender norms assigned to men, is being challenged or threatened.
"Men higher in precarious manhood beliefs expressed amusement with sexist and anti-gay humour in response to a masculinity threat because they believe it reaffirms an accurate, more masculine impression of them," said Emma O'Connor of the Western Carolina University.
The researchers hope the findings will help create a better understanding about the kinds of situations in which sexist and anti-gay jokes occur, and ultimately prevent this from being used, for instance, in the workplace.
"Work settings where women occupy positions of authority might inherently trigger masculinity threats for men higher in precarious manhood beliefs and thus sexist joking," said O'Connor, who points out that sexist jokes and teasing are the most common forms of sexual harassment that women experience in the workplace.