They do happen, but you’re right they’re usually centered in bigotry. I think “banged your mom” is more of a dominance play, as iirc there have been times where women have used “I fucked your dad last night” in a similar way, but it strongly skews the other way due to toxic masculinity and homophobia. Saying I fucked your dad last night as a man talking to another man would be suggesting the father is gay or bi, and that your yourself are as well.
They do happen, but you’re right they’re usually centered in bigotry. I think “banged your mom” is more of a dominance play, as iirc there have been times where women have used “I fucked your dad last night” in a similar way, but it strongly skews the other way due to toxic masculinity and homophobia. Saying I fucked your dad last night as a man talking to another man would be suggesting the father is gay or bi, and that your yourself are as well.