what I think he's pointing out is that Collectivism itself is inherently 'racist', as it is a Tribal worldview. ("It takes a Village" as Hillary says), or forms of Collectivism lead naturally to racism in some cases(see Neo-nazi's) other forms lead to say, radical Feminism
Cultural relativism just like moral relativism has a history of leading people to embrace racial supremacy or ethnic or cultural supremacy(take your pick), as its end result when analyzed. If there is not Right and Wrong, true/false(i.e. relativism), and thus no standards by which to judge cultures(Cultural Relavitivism) then why not choose the culture or morals of your likening, out of the air basically(or identifying features). Just ask the latest Supreme Court Nominee on that one, she openly states she cant be blind to justice.
Teaching that we have 'no right to Judge', which is itself a Judgement
Cultures are not external features(though the Fruits should be analyzed and no culture is perfect, all are fallen), Cultures are a component of a Worldview and set of values, all internal things, not external identifiers. If the worldview Western Civilization was founded on had traveled say to Africa or Asia, I fully expect they would've produced everything Western Civilzation did, and Western "White Male" Civilization would be a basket case, poor, etc.