I'm an intelligent guy. I identify as Native American, but if you looked at me, you'd probably see me as just another white computer programmer with dark hair and an unusually sloped nose. That said, I've met people so much smarter than myself that they made my head spin.
The two most intelligent people I've ever met were black and hispanic.
When I was a teenager, I had the distinct honor of meeting the reknowned Jaime Escalante in person.
I also recently had a coworker in my field, who was a young black man recently out of university, whom I will not name because he not a celebrity. (He certainly has the potential to be one if he so chooses.)
There was a striking similarity between the two that caught my attention. Jaime Escalante's struggle to engage young hispanics in math has been immortalized by Hollywood. The major theme of Escalante's work was convincing young hispanics that, despite their culture, they were capable of great things.
My coworker was very deeply depressed about the same situation as it applies to black Americans. He told me that he felt stunned and disappointed that so many of the black people he met had so little ambition for higher education. He even stated the problem outright. The culture encourages blacks to avoid higher education.
It's VERY easy to form racist stereotypes when you see a pattern imposed by culture. Watson reminds me of any number of people I've met who's 'met enough of' a certain race to close his mind on the subject. Despite his own intelligence, he chooses to ignore science and go with stereotype rather than go looking for cause and effect relationships like scientists *ought* to.
Incidentally, the third most intelligent person I've met is also probably one of the most humble people I've ever met. You'll probably never know his name, but his research will probably benefit humanity for millennia to come.