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Those are both really important things to take into consideration, I'm just not clear how they apply to this particular situation in which a white, middle-class man has made an apparently racist comment to a black, (probably) middle-class man. This would seem to be one of those (possibly rare) situations in which we can scrutinise issues around race and racism in isolation.
(I did read your other comment before you binned it, happy to edit to more accurately reflect the intent behind your previous comment).
racism = prejudice + power
Also Intersectionality I guess.