Well I'm not the parent of an Aspie but with many Aspie traits myself (going for assessment in August) I wish my parents had the knowledge that is now available about the condition. I'm in my early 40's so different time, different understanding of these things. As for your son, the best you can do is what you are doing. Explaining to people that he is an Aspie. If they refuse to accept that then I would think about how important it is for them to continue being a part of his life particularly if they are driving him to isolate/pick more and making him feel bad. You said he does not know his diagnosis. Do you intend to tell him? Asking because the thought occurred that maybe if he can spend time in the company of others similar to himself it may help with acceptance and self esteem.