Why do people think everyone of one sex or the other is good or bad?

Some people think all men are bad. All women are bad. All women are angels or all men are good.

People who think that was in my opinion are just plain stupid. Especially when people act like you’re calling one kind of person out. But they deflect by making it into a sexism issue when it wasn’t. Just says either you have poor reading comprehension or the fact that you’re exactly that kind of person. You don’t like being called out so therefore I must hate all men or all women right

Why do people think everyone of one sex or the other is good or bad?
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