I don't like public displays of affection too much. Okay, okay, I've been a hypocrite about this a couple of times, but it was pissing rain down and I didn't really foreign grannies were hanging around. They appeared out of nowhere!

Anyway. It depends on the kiss. A peck is fine. I don't want to see anybody totally necking it in public. Dee-fucking-scussting.

That say, I don't want to see either heteros or gay people doing that. I have nothing against gay people pecking or holding hands in public, same as how I feel about straight people. Sexuality isn't an issue to me.

As for getting kicked out... It depends on the kiss. You say gently kissing, which to me, is slow kissing, with tongues usually. Unelss you meant a peck, a quick touch of the lips, in which case it's an entirely different story.
I think there's a thin line between what should be tolerated and what shouldn't be tolerated. I'm on the fence with this, but I don't think it should have a thing to do with sexuality. Just with imtimacy in general, straight and gay.