Since autism is a spectrum disorder anyways, wouldn't this just mean that the standards for social interaction are lower, but there still would be a demarcation of social awkwardness within that subset? I don't think the country would be as different as people might think, and obviously, there is no common ideological thread that would unite people with autism, so you could have everything from Islamic theocrats to anarcho-capitalists, and everything in between.
In my experience* it's that people with autism are prone to have more hardline or unorthodox beliefs, so it would make for some interesting outcomes.
*by "experience" i mean posting on /pol/ and /leftypol/ and sites like AtlasWouldnt it also be like 98% male?
Where did you get that number? There's no way there's that big a gender disparity. Also, trans people are statistically more likely to be autistic.