What happens if a white men says the n word to a african american

According to the recent trend of soft-skinned people and lack of interest in facts, the most likely reaction would be aggression and perhaps an accusation that you are rascist despite you saying something that is a fact. The irony remains that a black main can call a white man "white boy" in an insultign way yet they are allowed and nothign happens yet once a white man say the "n" word, it spells his doom.