Tarantino saying the N word...
This is why so many people regard him as racist. There's absolutely no reason for a white character who's not even a gangster or anything saying the N word to a black character. Especially a character like Jules Winfield, it doesn't even fit in the script. It's like Tarantino saw this as an opportunity to say the N word and get away with it.
He's justified the use of the word in movies like Django but there's no need for it here.