I think it's just the misconception that someone who happens to be a genius is also fragile emotionally. Call it flighty, high-strung, whatever. It's one way us averages comfort ourselves because we are not so fortunate. I know, it bums me out. Boo hoo hoo
It reminds me of how us middle income people like read, or watch on TV, about rich people and all their problems. "They may have money, but look at all the problems they have. I wouldn't want to be them!".
I know people that have high IQ's that are extremely nice, and kind people. It is those attributes that I value. Plus, they have to laugh at my lame jokes.
Andee