" American blacks average a standard deviation lower in IQ than American whites at about 85. And it gets worse: the average IQ of African blacks is lower still, not far above what is considered the threshold of mental retardation in the U.S. And yes, it’s genetic; g seems to be about 85% heritable, and recent studies of effects like regression towards the mean suggest strongly that most of the heritability is DNA rather than nurturance effects. "
ESR's famous melodramatic-response to having his CML2 ("Eric's configuration markup language for kernel building") patch rejected by Linus is also quite telling about his self-perception and his perception of other people and his interaction with anyone who would have an opposing viewpoint to his.