The other misogynistic element is the Madonna/Whore complex, in my opinion.

Mothers are often classically viewed as the Madonna (it’s in the name), so they’re good and kind and virtuous.

However, I’ve insinuated that I fucked your mom, and if your mom has fucked, that means she’s a Whore because a Good Woman^tm^ doesn’t have a sexuality. By claiming that I’ve fucked your mom, I’m claiming to have defiled the sacred Madonna and turned her into a profane Whore.

In other words, saying “I fucked your mom” is basically saying “your mom’s a slut”, and in a worldview where women wanting to fuck is a sign of evil, that’s an insult.