Quite a few gamers (and geeks in general) are on the autism spectrum, me and most my family included. Being loud or having no social life just happens to be part of it for a lot of us. I have no social life other than gaming and a few cat related contacts. My husband is loud, and I'm sure a lot of people would consider him obnoxious, but he can't control the volume of his voice, he never could, despite years of vocal training. We have 2 players with tourette syndrome, one who constantly laughs or breaks out in song and one who keeps repeating what everyone else said over and over. My cousin who I get most of my published adventures from has a sneezing tick. Myself, I talk to myself a lot when I'm going through my notes or books and I guess that irritates some people as well. At least my husband tells me to shut up when I talk on the computer too much while preparing stuff. None of the mentioned reads body language well or uses it correctly.