I think that's because the Internet sucks, and LLMs are trained on that crap. For example, I notice that almost every time a professional female comedian posts anything on social media, the comments are filled with guys saying "that's not funny" or "no women are funny", even for women who regularly sell out large venues on their tours. If you inject all that as training data of course your model is going to "believe" the same thing.

I think this might be related to AI's difficulty related to contextualization. If I imagine Chris Rock or Kat Williams delivering these lines it almost works.

Welcome to 2024, where we somehow managed to fuck up society so hard that racial slurs are "based" and funny.