I'm going to be honest.
It's important to mention that I'm black, but most definitely do not speak for all black people, nor in any way does my opinion cancel out or lessen the validity of that of other black people who disagree with me.
That being said, I was willing to give him a pass* on the thread title alone. I'm at work, so I didn't watch the clip immediately when folks were around.
Maybe he was just going along with a song (was my guess at the time), and got caught up saying it, because I guess the lyrics must be in his head.
....once I'm watched the clip, I know that this was not just some isolated mistake. Dude probably uses the word very often, and enough so that when he didn't know the exact words to a song and felt the need to make a split second guess at them, lest he lose his flow, he found the N word to be a good go-to guess at the words.
He shouldn't be doing this, and deserves any backlash he gets for it.
For non-black people: Just to clarify, as I see a lot of miseducation and confusion in this thread, black people have no consensus on how they feel about this word. Even among black people, this a large range of views. Because of this, if you wish to be even a half decent person who even wants to pretend to not be racist, you should just never use the word, regardless of how the few black people you actually interact with feel. Those black people might run into disagreement and offense over it as well, but that's a different context and therefore conversation altogether.
However, if you want to make it known that you don't care how your words and actions might negatively affect black people, then go ahead and use it. I like it when I can easily identify you.
Free speech was never a thing. You'll pay for what you say.
*And by "a pass", I meant, I'll forgive him for slipping up, should he be sorry for it.