Culture Shock
I have spent serious time in about 7 countries and dealt extensively with people from some others. Never experienced culture shock as you are supposed to. It was the opposite.
At home, I missed the jokes, did not know the rules, misinterpreted the language, talked funny. And everyone thought there was something wrong with me, seriously rejected me or more. And I felt alone, WRONG.
In Ruritania, I missed stuff and talked funny, but hey - he is just an American. Nobody singled me out, people explained stuff to me and helped me communicate. And some of the local ways made more sense than the ones here.
Not really surprising it's that way. In your "own" culture, people will tend to expect you to obey the cultural norms, which an Aspie can't easily do. The nastiest little groups I've had to be involved with in my working life have been all-English.....they're always very quick to judge and cold-shoulder anybody who happens to be a bit different. But when there's a mixture of people from very different backgrounds, there are fewer social norms to worry about. I don't do particularly well in "pure" cultures that are different to my own though. It's hard to find one that's as quiet and reserved as the English one, and I have big problems coping with noisy people.
I've had far fewer problems with culture shock in various countries I've visited and lived in than in some parts of the US, my native land. I also seem to get along better with foreigners in the US than I do with most other Americans. Some of it probably does have to do with differing cultural expectations, some of it probably has to do with my own personal preferences and viewpoints (a lot of my views on things are probably better accepted outside the US), and some of it probably has to do with the kinds of people I've met in and from other countries (they tend to be intelligent, well-educated people who share my special interests).
I live in an urban area and commute to a rural area for work. Even though I'm not going very far in terms of distance, I feel like the cultural differences are almost as great as when I visited Turkey or Japan and probably greater than when I lived in a large city in central Europe.