In my opinion, a high IQ does not necessarily correlate with someone's ability to tolerate others, and vice versa.
If you're "less intelligent" (whatever that means), you can choose the attitude of always learning from other people, or being an resentful, insecure, ignorant asshole.
If you are "more intelligent" (again, whatever that means), you can choose between being willing to listen to and share your knowledge with others in a humble manner, and know that you always have something to learn from others... or be an arrogant, over-confident, all-knowing asshole.
So, assholeness applies to people of all IQ's... and being nice also applies to people of all IQ's. You see the whole spectrum on TFP. For myself, it's more likely than not that I fall into the general assholeness category, but I think that's more part of my "acerbic" nature and me getting caught up in the moment of expression.
