Some say 2, some say 63, some say as many as the human mind can imagine. Let's discuss all things gender here.
I'll start. There is/are 2 genders because facts say there is/are 2 genders.
This doesn't mean we should treat those who think they are a different gender badly or discriminate against them or anything of the sort. But they don't get to dictate to me that I have to ignore everything I know about biology and that I have to refer to them as xim or else I'm some sort of hateful bigot.