Soooooo tired of people incorrectly simplifying what a centrist would believe by taking the extreme ends and picking the exact middle stance. That's almost never how you get to a centrist view and it's a great way to ostracize them.
A centrist on gay rights likely sees that marriage is legal, culturally it's acceptable, so why should they fight for more rights, they're already equal?
I don't agree with this stance, but you'll notice it's not a "violent bigot" stance, just an ignorant one.