the number of gay/bi people outnumber the amount of straight people
Have you actually identified and counted the number of each group, or are you just going off the number of people who shouted "LOOK I'M DIFFERENT PLEASE ADD MY loveUALITY TO THE OP" and confirmation bias?
the number of gay/bi people outnumber the amount of straight people and the gay art gets posted in groups of usually less-than-average quality while the straight stuff is usually average or higher-than-average quality
that's really opinionated. People (unconsciously) look over art flaws if it appeals to them in some other way. It's reverse for me; I see a lot of cute guys, even the ones with no attempt at love appeal, whereas I see a lot of female art with no attempts at anything other than big breasts and other love appeal things.
It's also worth pointing out that I have nothing against posting females myself, I favorite them on FA more often that someone would expect, but I only very rarely post them, because every time I do, I get bombarded my a few posters in thread and several people on steam saying "WHOA ADAM POSTED A GIRL WHAT"
It's a really minor thing and it shouldn't annoy me, but it does, and I avoid posting them solely because of that. To some people I'm nothing more than "the gayest furry" and perhaps it's my fault for reinforcing that with occasional posts saying "no im gayer than you" but there's no reason I can't like a well drawn, non-loveual female picture