The best way to get people to stop stereotying and generalizing about those who are different is to stereotype and generalize about them.

Humans are complex and to put huge swathes of them into neat boxes is at best pointless and at worst counter productive.

It is also logically falliocus. To say "A man did this therefore men are like this in general." is like saying "Goats have horns therefore all animals have horns."

This misconception is at the root of all different kinds of bigotry.