Lots of things. Foremost the hatred of the average straight guy. You know the guy that was head of the family, worked for a living, loved women who were women and liked being women, and who built this country with his hands and his progeny.
Yep. And, IMO, that hatred stems from the fact that gays will never, ever, be that guy.
So, like typical liberals, since they'll never achieve that ideal, they'll work to make sure no one else achieves it, either.