This sounds like a problem with learned definitions. Like how the word racism is misunderstood between different participants in culture war clashes - for some it needs to be intentional and malicious, for others it's an expression of systemic structural issues that's not even always an individuals fault.
Sometimes such distinctions are made larger than they have to be in an attempt to legitimize one as more important. This is pretty common among some people who have Autism/MPD/DID/ADHD or are trans - where out of fear of being seen as less legitimate (or being denied medical care) facing widening diagnostic criteria, higher incidence (or general visibility; trans people are still rare - they are just a great culture war target) or depathologization a "true, legacy criteria diagnosed" and "fashionable self-dx on tiktok" (I'm really exaggerating to set the max bounds here) group are constructed.
Often that really isn't needed. These groups shouldn't be competing for space with each other. But sometimes they're made to - speaking from experience, people who don't believe trans people are "real" love to use the existence of nonbinary people to also attack those who fit into the "classical" strictly binary diagnostic criteria.
Sometimes such distinctions are made larger than they have to be in an attempt to legitimize one as more important. This is pretty common among some people who have Autism/MPD/DID/ADHD or are trans - where out of fear of being seen as less legitimate (or being denied medical care) facing widening diagnostic criteria, higher incidence (or general visibility; trans people are still rare - they are just a great culture war target) or depathologization a "true, legacy criteria diagnosed" and "fashionable self-dx on tiktok" (I'm really exaggerating to set the max bounds here) group are constructed.
Often that really isn't needed. These groups shouldn't be competing for space with each other. But sometimes they're made to - speaking from experience, people who don't believe trans people are "real" love to use the existence of nonbinary people to also attack those who fit into the "classical" strictly binary diagnostic criteria.