There wouldn't be so much discrimination against gays if there weren't so many gay people that acted totally ridiculous. That doesn't give people the right to make stereotypes about all gay people, but a lot of the stereotypes that fuel hatred against homosexuals would go away if so many of them didn't go out of their way to promote those stereotypes.

It's much the same with racism. Again, it's totally unjustified to discriminate against all black people just because some act obnoxious and violent, but it's also true that a large number of black people (moreso than white people in my experience) do act that way.

Stereotypes don't come from nowhere. People won't "find a reason to keep hating". When I was younger, I was a racist, not because of some intrinsic hatred, but because of the way a large number of black people acted, and the fact that I wasn't mature enough to keep myself from generalizing (my fundamentalist hillbilly upbringing didn't hurt either).

Now I'm more understanding and don't judge people based on their cultural peers, but nonetheless, I can't deny the facts that these stereotypes do have some truth to them.