You have to realize that the reason that you and every other human being with any sort of soul laughed at that video was because it was funny. An obviously white guy putting black crap on his face and acting as if he is black, even going so far as to act as if he's proven his point and calling his critics 'racists' is funny because it's farce. Reacting with laughter to absurdity, overconfidence, and delusion is just the natural human reaction to something like this; it's not funny because it's 'racist'. It isn't even 'racist'. The point of the video, and the reason behind its humor, is the overconfidence of the person in it. To get all 'snooty', the Greeks called this 'dramatic irony', because the audience is aware of something that the character isn't (namely, that no one in the audience is convinced that he's black), and so an emotional response is provoked (humor).
Only miserable people who want others to share in their misery can suppress that simple, organic reaction and replace it with this bizarre, mechanistic bitterness. They're the spiritual version of a neurotic who dissects every flower that he comes across, looking for some sort of disgusting bug, instead of just enjoying the scenery. Don't let these sad people convince you to feel shame for one of the few things that we shouldn't feel shameful about.