Well, yeah. Most of the information about PG kids at least alludes to the fact that they can be odd little ducks, and some comes right out and says it. There's a big question in some circles as to where you draw the line between PG/Asperger's and PG/odd duck. I have no answer to that one; my daughter's side of the line changes from day to day. Sometimes I think she was misdiagnosed, and then some days all I can do is look at her and say "oh, honey, the Aspie just had to come out to play, didn't it?"
And I share your frustration at the people who think you're bragging when you say your kid is gifted. Shoot, it's not like I made her that way on purpose, or that it's the result of my stellar parenting. Just genetic expression, like the fact that she's short, blue-eyed and nearsighted.
At any rate, do watch him when you start the stimulants. Some of them can increase the excitability. I'm not saying this to be anti-med, because I'm not particularly, but because we've had pretty dire reactions to two stimulants recently. One of them made her a complete freakshow-- I could have easily had her Baker Acted without anyone batting an eyelash. Thank heavens for short half-lifes.