The main problem I see with the multiple gender thing is that they are barely used in a descriptive context, but rather in a context of identity. (That phenomenon is not limited to that topic though.) Identity ideologies in themselves are pretty dangerous imo, as they tend to put people in a position where they would rather follow an irrational dogma than what they would choose without that identity, only based on the fact that that's just what or who they are. I do realize that the various number of social genders are a try to break out from the classic identities "man" and "woman", but imo, it just makes it worse. You can, for example, be a rather feminin man without having to use an extra complicated word for it. (Chances are that people wont get what you want to tell them by just using that word anyway. That some people would treat that reaction as an insult doesn't help a constructive handling either.) The key is to use "man" descriptive and not as something that is part of your identity.