Some thoughts:

A) As a predominantly straight man, I love the gay bars here. I don't get hit on the entire time, but it makes me feel good when it does happen (before I politely turn them down). It's honestly easier to meet straight, open-minded women in gay bars (here at least). Straight men in gay bars should embrace these things. It could benefit both their self-esteem and their luck with women.

B) I'm wondering if these men are in fact bisexual or if they meet the point on the spectrum that psychologist typically label "mostly attracted to the opposite sex" (key word "mostly", source: was a psych major). Why they're getting butthurt is beyond me. Perhaps they had a gay experience with a male friend they were attracted to and assumed it would always be the same experience if they went around calling themselves bisexual.

C) I like the feminine aspects of a person. I like vagina, and I prefer it to be "girly." I also realized over time that I can be attracted to a male who fits a trans description if they're very feminine, and even more rarely, another cis-male. I'm 100% okay with my sexuality, but it makes me nervous to advertise this aspect of myself on okc because I know I'm not going to be attracted to 90+% of the men who would fit this description. So I don't advertise it.

I wouldn't say that you're 100% in the right on this one OP. Someone who is truly bisexual is bisexual, and may not want to be with a dude for the moment. However, you're 100% correct that they shouldn't be mad that you approached them. They're wasting their emotional energy stores that could be put to better use elsewhere. Don't do the same and waste yours just because they're choosing to be an ass.