Um, I REALLY REALLY hate to say this, but things of this nature can't be learned any other way than the hard way. You could tell him something that could be framed on this website, and chances are it won't make a difference. I learned all this stuff the hard way, and it has paid off big time. I'm still not perfect, but I'm more aware when I'm loud than I used to be. When I was that age, I had problems with partys and stuff. And I have mild AS. So I'm sorry to tell you, but he needs to fall on his face in order to learn this. When he does, talk to him about it and what he could do differently. If I had the luxury of having someone right after the party to tell me what I was doing wrong...
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"An eye for an eye leaves the whole world...looking really funny because nobody has eyes." - Jon Lajoie