One of the arguments the school had against some of our suggestions for next year was that DS needs to work on his socialization skills.
I think the above is just what traditional teachers have been taught. Many teacher don't have gifted training and don't get this. They may have good intentions. Does your child have any experiences with older kids that you could mention?
"Good Social Skills" doesn't have to mean lots of friends, a few can be wonderful. If a child chooses to read instead of playing and he's not bugging anyone, he is adapting to the situation in a way he likes and that's wonderful too.