I have pretty much never seen anyone be hateful of anyone because of their sexuality, gender, or whathave you identity. We have men on here with vaginas, women on here with penises, we have lesbians, we have swingers, and we have people in dedicated poly-amorous relationships. Pretty much every discussion I've seen about that sort of thing just ends like "It's not my cup of tea, but it's your life."
While there are the occasional rude comments, they usually get told to get tolerant or get out. The awesome thing about this site is that we're all adults who understand that other adults sometimes do things we wouldn't do ourselves.
I've also seen some very constructive discussions on topics like this (such as "Transgender VS transgendered VS transexual") that I think really open up peoples eyes to things that they never thought about.