Yes, there is a spectrum, but you either are or you aren’t. There is no “a little”.
Approximately 6–9% of the population has ADHD, and approximately 2-3% of the population is Autistic. That is nowhere near “everyone”.
“Autistic individuals’ difficulties in smoothly participating in institutions’ social practices can lead to a stigma that lowers their status in the institutions’ social hierarchy.”— Alan Jurgens
Read my article on Meld of Minds.