To be fair, that's only some, not all.
If you're not a "typical" species, people find you odd, strange, etc, yet if you're a typical species, people will complain that you're not original enough. There's no real winning.
This is what I get all the time for being a Dewott, some people find it stupid, some find it weird, others find it unoriginal, some people love it. I once had someone say I was a pedophile because I was based off of a "children's show."
I wouldn't say the fandom is "accepting", just that there are many accepting people in it. To be fair, all fandoms have their issues, look at how people from like, Steven Universe tried to get that one person to kill themselves.
The best way to look at it is that there are at least some people that absolutely love Avians. Personally, I do, and there aren't enough of them out there from what I've seen.