I wager that high intelligence doesn't correlate with mean.
(I'm thinking of the friendly & funny Richard Feynman.)
But an unjustified high opinion of superiority just might.
Those who lord an imagined chess club sized brain over
us little folk should try instead to exemplify it, not claim it.
The truly intelligent are well aware of how little they know.
The problem, a la Dunning-Krueger, is that too many people who are not intelligent think they know a lot.