This is one of those sensory things that I pick up on because of my AS that a NT person probably wouldn't notice. Nail biting and nail picking drive me off the wall and it takes all I have not to scream at the person. Part of it is the sound, part is the repetitive motion, and part is the grossness. In one of my classes, I sit at a circle table with 2 other people. One is a nail biter the other is a nail picker. I mean I get if you break your nail and need to bite it down a bit, but it's gross to have your fingers in your mouth constantly when you're a grown adult or close to it. You wouldn't stick your fingers in your nose during class, I don't see how this is different. If someone near me is biting their nails, I have to look away, cover my ears, or discreetly cover my face with something like a book. I've never said anything to anyone about it, but sometimes I feel like I'm going to flip. The worst for me is a boy in my youth group who bites his nails so loudly and with so much force that you can feel the couch shaking and hear him from across the room, and his fingers are bloody. When I ask other people in private about it, they say they've never noticed. I guess this is one of those things that NT people just can't understand why it bothers me so much. Does anyone else go crazy like this with nail biting or another sensory thing?