I think some of the math/science thing comes from the fact that these are very concrete subjects and some Aspies (like myself) do better with concrete things (where there is a clear right/wrong) instead of language arts/social sciences/art where there is interpretation and subjectivity. Especially people who have trouble with Theory of Mind issues which make it hard to see things from s/o else's POV. Or trouble with symbolic, metaphorical language which makes interpreting works of literature difficult.
But everyone has their own thing, really. And I'm into History and Politics but have to work hard at understanding that when people disagree with my interpretation, it may not be a lack of evidence or understanding on their part. They might just have a difference of opinion and that's OK. For me, math is very logical and linear and therefore easier to understand than literature or humanities like Appreciating Art. (I leave off music because that's very math-like when you really get down to the theory.)
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"Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind."