The whole conversation in that clip is fake and ridiculous.
a) He didn't use the hard -er ending.
b) He's been saying it for a long time, even in conversation with Woodley, and no one gives a fuck.
c) It's part of his regular street vocabulary and he has explained this before.
d) He wasn't calling a black dude n****r in a racist way. He said it in a generic "Back up n***a" to a random guy, who I'm not even sure was black. He also called a girl a bitch in the same clip, lol. Come on now.
e) He did call Michael Jai White a bitch ass n****. I don't see it as racist, although I'm not black, but I understand if people aren't ok with this instance. It's being used as an insult, although black people use the same insult. However, that's not what happened here.
Now, if we wanna discuss whether you think it's ok for the n***a word to be used so commonly, or for him to use it in general, that's a separate discussion and totally valid. But these two are having a dishonest conversation.