"........culturally isolates Autistic people from their environment." I agree.
"In a way, Autistic people have their own unique individual cultures. In that sense, we truly do live in our own little worlds. We live in our own little worlds, not because we choose to or because we fail to understand the world we live in (some Autistic understand actually the world far better than many “Neurotypicals”), but because our inability to relate to the culture we live among sets us apart from that culture." I agree.
"Consider how it would feel to be a North-American or Western-European living as the sole immigrant in a rural community in East-Asia, sub-Saharan Africa or South-America. That is exactly how a person with Autism experiences every day social interactions." I have always felt like a foreigner in my own country, community. In the culture, but not able to fully identify as part of the culture.
"Ironically, this makes Autistic people more adapted to living among people of a different culture. One one hand, it’s because people tend to be more forgiving about social mistakes and quirky behavior when faced with a foreigner. On another hand, that’s because people with Autism are so used to living among people who identify with a culture that feels alien to them that actually living among a foreign culture feels only marginally more alien than their every day experience." I could see this. I've been to a number of foreign countries and I didn't really feel much more out of place than growing up/living in the U.S.
My world is largely in my head.