What's the noun for autistic? Here's the word you're looking for.
autism
(clinical) Pervasive neurological disorder that is observable in early childhood and persists throughout the lifespan, characterised by atypical communication, language development, eye contact, and sensory experiences.
(clinical) Synonym of autism spectrum (disorder); generalization of the specific to a range
“As things stand in British arts, only an autist would dare to profess disinterest in diversity.”
“But if many virtues are inaccessible to an autist, so too are many vices.”
“Part geeky film buff, part high-functioning autist, he seems not so much a person, more an assemblage of everything that men think women resent about men.”