I've never had a real problem in a gay club. A few may ask, I simply say I'm not gay - or I'm with a woman and they get the hint. Or a gay friend will tell another guy "He's not on the team" - in respectful friend way.
I've had my gay friends send girls my way.
Have I been hit on, yes. So that's what the ladies feel like, huh. I've never been insulted in a gay club. Some disappointments for some...
But you know what, I think its healthy that a hetrosexual can be in a gay club for many reasons... as gay people are simply people.