JackOfAllTirades
Explorer
Is there some kind of consensus as to what constitutes "stupid"? Some people are goofy or lack great social skills. Doesn't make them stupid or mean someone else gets to sit in judgment of them. It's gaming. I've met so many odd personalities in gaming that if I judged people in the fashion Majoru appears to judge them, I have rid myself of numerous gamers at conventions or game stores.
Calling someone else stupid behind their back and talking about "stupid meters" and the like is immature and gossipy.
Actually yes, some people are just plain stupid. They're not being "goofy", it's not a lack of social skills, it's not a personality quirk. They're think-headed. Not the sharpest knife in the drawer. Slept in the day IQ points got handed out. And tantrum-boy sounds like a classic case.
Seriously, go back through the OP's descriptions of things he's done in-game and ask yourself: would anyone with an IQ above room temperature have seriously considered doing any of that? I don't think so. If I had to play with somebody that dim his character would have met with a bad end a long time ago. It would've saved the GM and the rest of the group a lot of trouble.