Some of these comments feel a little hurtful to me but I don’t think they are trying to be, what they are trying to convey is, absent a perfect (or near perfect) SAT score, you probably won’t get into the schools on your list in a STEM field even if you were from the US. I actually think the autism stuff is a really good hook and you will have a significantly better chance getting in to these schools emphacizing that and not making yourself out to be a math and science person. Perhaps if you present yourself as having an interest how science informs the social sciences, that might be interesting enough to cull you from the crowd of international STEM folks. If they are looking you as a social sciences major with those science scores, now you look kind of amazing.