There are definitely people who take "otherkin" and follow obscure gender identities, but they are overwhelming uncommon. And even then, I honestly suspect that it's 50% smear propaganda... So what I guess I'm saying is that there's no REAL reason to fear that something like that would come to pass
The problem is (as it ALWAYS is) that these vocal minorities are the ones spreading hate and playing the victim. But then, rational people rarely are heard. The politicians, the ones that want to enslave all the non-binaries, will take these loud bullies as the example of the people who want more specific ways to identify.
It's kind of like how when a tornado hits and they always find that one stereo-typical redneck couple that MIGHT have a double-digit IQ if you add both of them together... There are plenty of completely rational, intelligent people..but that's who the spokespersons are. Or when people badmouth the NRA and their example is always some militia group in Texas that flies a flag over their compound with the NRA logo. (Personally, I think the NRA are all money grubbing scum, but I don't believe all of their members are...don't go off on a tangent about gun control..I was just citing an example!)
I'm a big geek...I've been to a LOT of animé conventions...and guess what! I'm pretty sure that straight, white anything is the minority at those events. Every line you stand in, you hear some girl-like person talking to another girl-like person about being trans and either praising or bashing people for their beliefs. On the other hand, I've had perfectly nice conversations with some that I could only assume were trans, but it never came up in conversation...so final point..and a throwback to what I said in an earlier post...
If you have to tell the world what you are, then YOU are the one with the problem. I don't need to be told you are gay, straight, black white, male, female, a six-sided die, or, believe it or not, an Apache helicopter! Interacting with you as a normal and fellow human being will tell me all the information I need. The only time I NEED you to bring up gender or preference is if we're going into a relationship, then it becomes a bit important.