I don't think this is a Capitalist thing explicitly.

Being significantly outside the norm in visible ways is often a problem in any human societies, mainly depending on which traits one has which are most different from the masses and the time and society one is in. I mean, a highly intelligent woman with knowledge of herbal remedies in a 12th century European village would likely be deemed a witch, in a Native American tribe would be a healer and in present day society either nobody would notice or think her as old-fashioned "with all those teas".

I expect that Neuro-divergence, being behavioural, is one of the hardest to accept as "normal" things in any human societies since humans are generally social beings. I mean, in present day in most of the West even Introversion (which is much more prevalent) is often perceived as a problem that people must overcome ("You need to go out more") rather than just another perfectly normal way of being.

As I see it the neuro-divergent are just unlucky of living in an age of cities were it's pretty hard for people to just live away from the rest most of the time and being out of the norm behaviouralliy ratther than say, in terms of body shape or having a preference for unusual foods.

PS: Now that I think about it, the whole insane "grift everything" culture of the current Late Stage Neoliberal Capitalism probably makes life way harder than it need be for people whose more variant traits negativelly affect social interaction, since in so many areas where merit in that domain was usually enough, now one must "pitch" and "network" a lot to get ahead.