It's only divisive to assholes. If other people being who they are, in a way that doesn't harm (generic) you or anyone else gets you this riled up, you can be confident that you're the problem.
Gay people: We'll be gay, you can be straight, everybody can just be who they are. We'll call you by whatever pronoun you want, you do the same for us, everybody wins.
Homophobes/the Right: we'll be straight, but you can't be gay; or if you are, we'll oppress you, marginalize you, discriminate against you, withhold rights from you that are granted to heterosexual couples, preach hate towards you and paint you as lesser-than, abominations of God.
I wonder if you can spot the difference. It's almost like one side preaches inclusion, and the other ... doesn't.