When it's a spectrum, boxes are just a reasonable grouping for social means. If you're in a group who has embraced the idea of gender theory, you may make those boxes more granular, but that can be a shock to people that, until fairly recently, had accepted a binary option. In those cases, it may make sense to speak in more broad terms. To be clear, this meme is disingenuous and probably more than a little crass.
Also to be fair to the meme, it's a meme. Crass and making generalizations to paint a situation in a slightly humorous context is the name of the game. No one actually believes that we apply such sweeping generalizations to everyone. Not to mention where the meme is posted. We are in 196, a queer positive meme community, on blahaj zone, a server whose name references a product which has become a known trans symbol. The memes are going to be LGBT related in general. Anyone arguing that this meme is in any way divisive is likely doing so in bad faith and wasting your and my time.
You are replying to a commenter making a joke about how more gender nuance is somehow related to your status, like we get it, you have the one joke punching down on gender non-conforming folk and cannot for the life of you think up another. Literally attack helicopter levels of bad joke. What the fuck is this comments section.
And some trans people don’t. Like sorry I fall into the contra camp. The only time I really understood gender beyond dysphoria and avoiding it was after two tabs of acid and several years of transition.