Gay Men invalidating Lesbians?

What is up with gay men that don't believe lesbians exist? We're the opposite side of the same coin of them and yet they invalidate us over and over. Like you exist? So why do you think the vice versa of you isn't real? Is it misogyny? Just generally being male-centered?

I'm just venting talking about a recent experience (but it's not the only one I've had). I was at a gay club this weekend that I go to pretty much every week, I'm a regular that the staff know too, I almost always go alone and really dress up and turn a look cause that's half the fun for me, I love it there. Since I go alone I usually end up befriending lots of people for the night, and sometimes when it's gay men it's really effing uncomfortable. The first question I'm asked "Why are you here at the gay club?" It's a gay club and I'm a lesbian, there are trans and queer people here too? The security guard that checked you at the entrance is lesbian.. What do you mean why am I here? Usually then they move on or I find a way to leave and interact with someone else or go dance or something, but this time the conversation went on and at one point the guy made a point to say "When you get a girlfriend.. or boyfriend," and overall throughout the whole conversation just very clearly didn't take me seriously at all. And it's all sandwiched between very disingenuous flattery, a compliment about my outfit first, turning to his friends and going "I love her, we just met, but I love her," it's so snarky and rude.

I just don't get it and felt very frustrated after finding a way out of that conversation. This is the last thing someone wants to experience in a queer space around other queer people. Gay men seem to be some of the worst offenders in the community sometimes for just not taking anyone else in the community seriously except themselves, why? Why though? Any insight?