There are only 2 genders

[BmorePat87]

Disagree. Gender is a social construct. Some cultures have "third genders", though I'd say that gender is a spectrum with two ends, with people falling somewhere on that spectrum and most people identifying with the end they are closer to.

I also do not think someone who is trans is any more of an expert on gender than someone who isn't trans (I don't like the word "CIS") is, just as someone who is bi isn't any more of an expert on sexuality than someone who is straight or gay.