Rhymefest is misremembering. Em used that "facial tissue" bar against Allstar at the same event. I doubt he said it twice to 2 different people and decided to add for "nikka" one of them
He used the razor blade hit you racial tissue line against JUICE as well, he used bars from the infinite ep at scribble jam as well, hes got multiple songs from back in the day saying racist shyt and using the n word, hes used it hype manning verses for Dre, 50, d12, royce erc, I'm confused why ppl are acting like recycling rhymes and using the n word is out of character for Eminem.