Having spent several months in an aspie social skills group without much in the way of correction of my behavior, I'm starting to think that I am often isolated by omission rather than commission.
I think commission is when you turn people off via weird behavior or saying offensive or inappropriate things. Omission is when you engage in outright avoidant behavior, or when you wall yourself off from people and fail to take the steps necessary to develop connections with others. I think I tend to become an emotionless zombie when I am anxious or face sensory overload--also tend to develop anxious or standoffish body language--and I have trouble talking about even harmless personal information. Nonsexual relationships, as a result, never even have the chance to develop at all.
I feel that, while I may have both, particularly the prosody issue at times, my biggest social weakness is a series of omissions.