Racial Prejudice

Racial prejudice is making a judgement about someone based exclusively on their race, interestingly it doesn't seem all prejudice is inherently racist - for example positive prejudice wouldn't fit the definition as it excludes "based on the belief that one's own race is superior". from its reasoning ie Asians are stereotyped as being awesome at maths but this is not racist - even as a prejudice - as it does not project or come from a basis of racial superiority to Asians.

This is somewhat a fine line to walk, for example James Watson caused a stir by developing research which indicated blacks (specifically Africans) have a lower average IQ http://www.independent.co.uk/news/sc...rs-394898.html and this was called racist. I havent looked at the study so I've got no idea if its any good (I simply don't care if its true or false, individuals render the trends irrelevant) but the salient point is thus;
(a) Did he have a prejudice of superiority? Did he examine this assuming the white man to be smarter? That would be racist,
(b) If not, did he conduct an honest and rigorous study? If he is merely concluding results based on general testing of racial difference then arguably that's not racist for example it's known such differences exist with white people only ever running a sub 10s 100m once in history.

So is Mr Watson a racist? Does that matter IF he's right?

What about 'reverse is true statements' ie if I say black people are better runners than white people, which is not based on superiority as its a statement about a different race being superior, does it become a statement of superiority if a black person says the equally true 'white people are worse runners than black people'? Is the superiority described abstract or direct? Does it mean as a whole or in each individual instance.

My point is, racism and racial prejudice are different in definition (as I hope I explained) but also nuanced topics in and of themselves.