He sounds like he has aspergers, despite not having two of the criteria. He also sounds like he may have sensory defensiveness problems. Does he have difficulty with tags on the back of his shirts, and socks that don't feel right, and a very restricted diet?
I wouldn't worry about he joke. A 10 year old child has a different humor level than an adult.
Thanks for the response. Everything I have read says all criterta must be met for a diagnosis. No problem with the tags or clothes. Very restricted diet mac and cheese, cheeseburgers, P&B sandwiches, cereal and candy. A bit clumsy running. Big on any video games and tv. When he was younger he talked with a strange speech pattern...simular to "little professor" as discussed in asperger's documents. He's never done any of the repetative movements.