Autism

Given how they are a cluster of conditions where most people have some subset of noticable conditions, I'm not sure there is a clear way to differentiate them.

Also, the last person I saw who brought up this argument about how functional they are and how it was unfair to people who are less functional was in the same comment also simultaneously talking about how they're depressed or suicidal from extreme loneliness and strongly wished to be cured of their autism. That hardly seemed functional to me if you are struggling so much with life even if you can pretend to be functional enough to hold some jobs. I think many people have a strong tendency to downplay their own suffering. You can see the same behavior from people who've been victims of abuse who frequently will deny they've ever been abused, but if you ask them to describe what happened, they'll describe abuse and then just try to say it really wasn't that bad or that such is normal.

Also, we already have terminology to refer to lots of those traits commonly associated with autism. Nonverbal, hypersensitive, speech-processing disorder, and more. If there's a reason to communicate those things, you can do so with or without mentioning autism.