your last sentence prohibits my reply.
guilty as charged.
how do stereotypes become? Is there any basis for stereotypes?
I've recently begun to study psychology, and I'm learning that when we place ourselves into social groups we often associate feeling good about our group by feeling superior to other groups.
Taken to extremes this can get pretty nasty.
It's a psychological explanation - not some 'great truth' I'm spouting.
Makes a lot of sense to me, though :)