I think a lot of people confuse neurodivergent with autistic as well.
The whole field needs a reorganization anyway. I've talked to dozens of therapists about this and I've received wildly different answers on what autism even is.
And conversely, autistic as a savant was a thing 25 years ago. Long before the social media.
John, 38 yo virgin, spending 50% of his income on Gundam figurines while living with his aging mother and having no IRL friends is supposedly not "autistic enough" for you if he can hold a job, walk and talk normally? What about that one girl you went to high school with who couldn't stop talking about Supernatural and had a full-on meltdown in front of the whole class on more than one occasion, to the point where she had no friends by junior year and got severely depressed?
These characters were seen as "just weird" until actual scientists started figuring out they were autistic, and now they might have a better life with treatment and the necessary disability benefits
Anyway, I suspect "in the past" is further in the past than you think: the distinction between Asperger's and ASD has been officially ditched by the medical community for 12 years now, at least insofar as the DSM represents consensus.
I'm gonna push back on this. There isn't an objective way to diagnose someone with autism like there is with, say, a vitamin B deficiency.
What we do know is the medical community continues to diagnose boys with this condition at a much higher rate than girls.
This would not appear to imply a "false" belief.