I May Have Found The One Single Time It's Okay For A White Person To Drop An 'N-Bomb', But I Need Confirmation

Let me set the scene...

Went to a hip hop show over the weekend. Pretty small venue. Couple of unknown openers to start the thing off. Well, unknown to me anyway. Apparently the only opener who was worth a damn had a huge fan (some would say 'stan') in the crowd. Apparently said fan had been tweeting at him all day saying he was going to be there and wouldn't you know it, positioned himself up next to the stage. Anyway, in an act of charity, or I think that what it was meant to be, the artist (black) invited the fan (white) on to the stage to perform a song with him. Got him an extra mic, the whole nine. Here's where it gets interesting...

The song in question, that the black guy ASKED the white fan to perform with him had no less than 100 'n bombs' in it. It probably isn't, but the most logical title for the song would have to be a word that has been used to demean African Americans for hundreds of years. I guess my question, from one white person who censors his song lyrics when reciting them in public to probably a host of others, is what the fuck do you do if you are that fan? You either censor yourself for 80% of the song and sound like less of a fan or you just bellow words that more closely resemble racial slurs when they are coming from your mouth specifically. Ultimately, he kind of acted nervous and half heartedly  mumbled his way through the song, but I don't really think that was his intention. I think he really was just nervous to the point of peeing himself, but still, that's got to be the best way to handle it. I would urge anyone in a similar position to do the same, but the question remains...A black rapper asking a white fan to sing a song that's riddled with 'n bombs' at a hip hop concert has got to be the most acceptable time to comply with such a request, no? If there were to a safe, understanding space for such an interaction to take place that would have to be it, right?