I did find that remark quite shocking, as a matter of fact. This idea was de-bunked when I was at uni many years ago. Time and again IQ tests have been shown to be highly biased towards a certain kind of intelligence and surprise, surprise white males do really well. Could this be because IQ tests are constructed and set by white males?
Tennis-girl and Joe make valid points too.
People are far too accepting of so-called facts and use them to prop up their own particular prejudices. But there again, the education system hardly encourages independent thought. Heaven forbid we should have a free thinking population that challenges perceived wisdom.