I am reading 'Promise of a Dream: Remenbering the Sixties' by Sheila Rowbotham, a British socialist feminist writer and historian, in which she remembers her life in the 1960s. She was born in 1943.
For years she had been regarded as stupid until she was accepted for a place at Oxford University to study history and literature, whereupon she was classed as clever. This left her "permanently perplexed by the arbitrary nature of what was defined as 'intelligence'."
Although more involved with socialist groups in London, she was on the fringes of the counter-culture, the hippie scene. She used cannabis and occasionally LSD. She writes about her experiences with acid. "Each time it brought some insights I valued. Acid stripped away many of the socially acquired buffers and reminded you of the wonder of the ordinary. It intensified for me the capacity to see beauty in details which my eye would normally have lazily passed over, and it deconstructed the customary".
She writes that "in rejecting the ways of 'straight' culture, hippies surreptiously introduced implicit conventions of their own. Exclusivity and hierachy appeared and were policed with the sneering snobbery of 'cool'."
In 1967 she became friends with Lawrence, an American guy who was a surfer from California and a draft dodger. They travelled to Spain and Morocco together. Later that year he returned to the USA. He was arrested in Hawaii and put in prison for refusing to serve in Vietnam. When he refused to eat he was put in a strait-jacket and kept in jail under observation for a month; being diagnosed as "a chronic schizophrenic manifested by severe hallucinations, loose associations and autistic behaviour."
I would guess that there were autistics who were part of, or on the fringes of, the hippie scene in the 1960s or later, as a place where they could be accepted for their differences, where they could fit in.