Why don't you believe in non-binary? Did you believe in it before? If it was this way, why?
There is nothing people have said that convinces me that it's a legitimate gender. Other then self-reporting, there is not sufficient neurological data to support the existence of a non-binary gender like there is to support the gender incongruence of binary trans people.
I think a lot of the gender dysphoria described by non-binary individuals is either gender dysphoria that is actually binary or is actually body dysmorphia or poor body image miscategorized as gender dysphoria.
Without gender dysphoria, you cannot be transgender. So that also eliminates a lot of non-binary individuals who don't report gender dysphoria. I also believe gender euphoria and gender dysphoria are two sides of the same coin. It cannot exist without gender dysphoria.
I did used to believe in non-binary genders. When I was a middleschooler I actually identified as non-binary for some time. This was 13 years ago when tumblr was still relatively new. Until I met my friend who was actually transgender and was able to see what gender dysphoria entailed. We were not the same.
I do use they/them pronouns, and I do not go out of my way to tell specific individuals their gender is invalid, despite what I think. I just don't think it's helpful. And I do support people who are trying to push non-binary in a direction where it solely refers to gender expression.
