Even if it was completely serious, it just becomes a dumb statement. Its just showing how everything can be reworded to be presented as a binary choice like this. It doesn't actually say anything bad about people for identifying any sort of way.
For example, there are a lot of species birds, but they can all be described by the binary choices of: Is Crow, or Not Crow. Still, its very obvious to anyone with a brain that it's not the most helpful way to classify things.
other people are trying to disprove you about the post content and maybe they are right
but you are absolutely correct about the site getting worse. i reported multiple transphobic comments under this post and elsewhere in the past day. so maybe the post isn’t transphobic but it is giving a place to spew hateful rot