Bit of a risky topic here...
First of all, I'd like to say that I'm simultaneously surprised and unsurprised about what you've heard about South and East Asia concerning attitudes toward autism. Surprised, because earlier threads and posts on WP spoke of the percentage of autistic people in East Asia being relatively high when compared to the rest of the world (for unknown reasons).
Unsurprised, because East Asian cultures are indeed very much concerned with hierarchy, and placing community before individuality, and a fairly sophisticated and complicated set of social rules and cues, both verbal and non-verbal. So, it would follow that someone with autism would struggle and stumble a lot in an East Asian society.
However.
I was born into a Eurasian family (from the maternal side), and most of the values and social interactions that we hold dear originate in East Asia, to be precise, in Indonesia and China. For me, it was very warm and comfortable to grow up in this particular family. And later, meeting other Indonesian-Dutch mixed people, but also full-blooded Indonesians from Indonesia, I find it relatively easy to move among the crowd. Partly because the culture is familiar to me, and partly because I experience that they are not shocked when I'm a bit more quiet and aloof, because I find East Asians in general (consciously generalising here, now) tend to be of the quiet and aloof persuasion, or if they aren't, at least have an understanding and respect for it.
I have experienced much the same in my encounters with Chinese, and perhaps most notably, Filipino's.
I worked at a factory for six months. The factory was culturally and ethnically very diverse. There were Caribbeans, Surinamese, Filipina's, Chinese, Nigerians, Ghanese, Iranians, Pakistani's. I was quiet about my autism with most people, though some -mostly higher-ranked- were aware, and they didn't disrespect me for it. They saw I was putting effort in my work, and judged me on that.
There was another colleague who had a different psychological disorder, and all the colleagues, without exception, treated him with the greatest respect.
But I do believe that it makes sense if cultures that are more community-minded and less individualised, are more easily put-off by autistic 'symptoms'. I have experienced things that indicate this, but it's all too inconclusive to share with you guys here, and it goes against my general opinion that actual prejudice toward anyone who has a disorder or a handicap is not tied to culture.
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clarity of thought before rashness of action