It does sound like he has some issues that would be covered by the autistic spectrum. My son is a T2 in the making as he will only eat food in breadcrumbs, ham, chicken , and some veg- he would live on Pringles and french bread if allowed to. Poor eye contact is a classic feature and can be worked on- my son has got much better over the years but when he goes off on one of his tales his eyes still drift heavenward! It is very much a spectrum and if you feel he needs help, then even if everything else is going great, they should listen to your concerns. Some children just like down time after school and maybe he is social networking on his computer- also he is at that hormonal surge time when even the sweetest tempered of kids go all huffy and monosyllabic.
@zand I remember junior having to do the primary school baseline tests that all the kids took- they asked what was the difference between two pictures of bears, the " correct" answer being one was bigger.. the teacher said he gave at least 30 other differences and looked at her like she was an idiot when she mentioned the size one as though it was beneath anyone of any intelligence to acknowledge so obvious an issue.