There are really only 3 genders... male, female, and binary/gender neutral. These three genders are the only ones that people accept and take seriously. If you claim to be an alien, a cat, a rock, an animal, or anything else, etc. you are a fruitcake. You can identify as whatever you want of the first three.

There are also only 3 biological sexes, male, female and in rare cases hermaphrodite. You cannot choose which one of these to be. People conflate gender and biological sex. Gender is a social construct, sex is fixed and doesn’t change. It is what it is.