When you argue on their terms you concede the point

“The problem with people who argue for inherent racial inferiority is not that they lie about the results of IQ tests, but that they are credulous about those tests and others like them when they shouldn’t be; that they misunderstand the implications of what those tests would indicate even if they were credible; and that they fail to find the moral, analytic, and political response to questions of race and intelligence.” 

…the tests have a validity problem in that they don’t correspond well to what we typically mean when we discuss “intelligence” in a lived sense, and a reliability problem in that the consistently perceived racial differences are not reflections of actual differences in intelligence but of systemic biases that render the metrics flawed. (via L’hote, someone everyone should be reading.)