Example being raised in California, the gay right groups were trying to force schools to teach "being gay" to kindergarten and first graders.. Look, these kids can barely recognize sex differences, why on earth would you want to teach kids of this age about being gay? Why do you think there is a backlash?
I doubt that schools are teaching "being gay" as though it were simply something that kids could learn. What I imagine they were teaching is that "being gay is OK," which is a lesson that you really shouldn't object to. Children should be exposed to the idea that a family doesn't have to consist of one father and one mother to be a real family.
A brief story. I am the son of lesbian mothers, so I'd say I have a pretty good handle on what it means to grow up in a "non-standard" family. When I was in grade school, one of the more popular activities in the after-school program was a game called "Smear the Queer." It's just a basic tag game, and pretty damn good fun at that... but it was a bit awkward coming from a gay household and playing a game with a clearly homophobic name. I tried talking to the other kids and telling them that saying queer was insulting my family, but they didn't pay any mind (much like the lady who ran the program); that changed in a hurry when one of my mothers overheard the children talking about it in the hall and spent the next five minutes lecturing everyone (including the woman in charge) about why it was unacceptable to say such things. That was even more embarrassing then talking to the kids myself, and all it accomplished was us not being allowed to play a fun game because it happened to have a stupid name.
That whole mess could have been avoided if we had been learning from the beginning that you will encounter people who come from different backgrounds than you. There was a bit of that going on already, sure (we had a few exchange students from places like Liberia and Eritrea, so we were exposed to different cultures). But it was the 1980s and discussing homosexuality with elementary school kids was still seen as taboo (even though "Smear the Queer" was acceptable). If it falls solely on parents, or worse, their peers, to educate grade school kids about these things, they aren't going to learn it. And I don't care how uncomfortable homosexuality makes you, it is not fair to let the children of gays and lesbians be mocked and outcast because you don't want to have that discussion with your kids. Schools should be a place where everyone feels welcome, and you won't achieve that by attempting to sweep diversity under the rug and pretend it doesn't exist.