I see it like when the USA government treats some countries as drug hells. They say that but they take a generous slice of that business AND from shitting over those countries indiscriminately. I see all of these cases as a matter of incentives.

Maybe generalization comes with some hidden reward for doing it

She knows nothing!!!

Men are awesome! I've always known and believed this.

I had a roommate once who said she hadn't really met any awesome guys. I confronted her with my very different experience.

She was not someone who had a high self love, and thus choose to hang out with people she felt comfortable with, which included not great guys.