Stephen Jay Gould wrote a book about it called "The Mismeasure of Man". You can go to C-SPAN.org and see his 1994 speech on it.

The Brahmin say they are the chosen people, the Jews say they are the chosen people, Presbyterians say they are the elect - it's hard to reason people out of what is essentially a religious belief.

As behavioral modernity was not on display until 40000-50000 years ago, the idea that there is some significant genetic difference in this aspect seems silly.