My husband and I have never met any truly unfriendly gay singles or couples. Some might want to be left alone and that's cool. Rest assured, friendly as I an, I still absolutely love my "me" time. Some folks tend to be very shy or have social anxiety, which can come across as "stuck up." Who knows? I can say that neither of us are remotely shy, both very outgoing, and happy to meet and chat with anyone, gay or straight. But we also are very cognizant that sometimes people don't want to chat or whatever. And that's totally ok and not for us/me to figure out why.
I do recall on one of my solo cruises several years ago, I was at one of the bars when it was fairly empty. I was sipping a martini and clearly reading my Kindle. I was admittedly really into the book (huge reader here). A guy sat next to me and immediately struck up a conversation. I didn't close up my Kindle but chatted briefly, was polite, and when there was a lull, I started reading again. He noticed. Another guy sat next to him, and "lo and behold" it was his husband. They stage whispered to each other that it figured the "pretty boy was into himself". *****? I closed my Kindle, smiled, and said "nope, not into myself. I was reading (waggled my Kindle towards them) and was in the middle of a good part of the book." They were clearly embarrassed when I called them out and moved away.
Saw them later on and the original guy called out to me "read any good books lately?" with a smile. Ended up chatting and having cocktails with them the rest of the cruise. Nice guys that made the wrong assumptions.
It's easy to assume someone is stuck-up or conceited, when the reality can be far, far different. Don't make assumptions.