He just suspects that if we give anybody equal chance, just because of genetic ability the result won’t be proportional to population numbers.
What is tolerance?
Sceptical Meerkat

How would south Koreans have more than double the IQ of North Koreans with IQ is a pure function of “genetic ability” .

If Richard is interviewing two people and they have a tie in their interview scores. Richard would probably go with his “genetic ability” theory and hire the non black person. Not sure if someone can hold both “genetic ablity ” opinion and “ people should not be judged by colour of their skin.” opinion simultaneously.

That could be called intolerance.