Not all Scandinavians (or descendants thereof) have blue eyes, either.
Really, I think it's just cultural differences, not everyone there is autistic. I had a case manager who, because his wife is Norwegian, assumed that some of the things I do that are part of being autistic for me, were cultural instead (such as being uncomfortable around some of what I consider pretty extreme displays of emotion (even positive emotions), and other personality traits). But actually my mother doesn't share those traits with me, she's in fact the exact opposite in some ways, and she's the one whose family's mostly from Scandinavia. People there aren't all autistic, but there are some (definitely not all) aspects of the cultures there that look out of place where I live in America.
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"In my world it's a place of patterns and feel. In my world it's a haven for what is real. It's my world, nobody can steal it, but people like me, we live in the shadows." -Donna Williams