Who says kids with Asperger's are impaired?

We're four days into summer camp and it's going well with only the most expected bumps in the road.
My two sons are together at a city recreation center basically being occupied with various field trips, games, and sporting activities for six hours every day - which is great for me and a learning experience for them.
The first day, my youngest got a terrible sunburn. He decided not to wear the sun/swim shirt that I packed for him because none of the other kids were wearing them. As a result, he's in a pretty good deal of pain across his upper back and shoulders. In fact, Wednesday, my oldest (the one with Asperger's) called from the Rec center and reported that his brother was crying in pain and he thought it would be best if I came to pick him up.
When I got there, my oldest was ready to leave too. I asked why he wasn't staying. After all, they were going bowling and to a movie. It would have been a fun day and the activities were even of the sort that didn't involve a great deal of social interchange. In short, bowling and movies are what I call "simultaneous unshared experiences." They're activities that he likes because they appear normal and don't require him to dive into deep social interplays. He loves them for this reason.
But he didn't want to stay. His actual reply was, "If my brother can't stay, then I'm not going to stay either. it wouldn't be very nice of me. I'll stay with him and make sure he's okay."
Now this comes from my child with Asperger's - the same kid who's not supposed to be good at either emotional inference or social interplay, who has a really hard time with jokes and definately has to work at understanding ambiguity and duplicity. And yet, consistently, he teaches both his brother and me that the degree and style of his disability haven't affected his ability to feel compassion, understand complex social situations and provide clear, unblemished emotional support in an extremely sincere and mature and unexpected way.
So who exactly is the one who's disabled here?