What I've learned about that word is context, where the world is coming from - in the era the film is set, it obviously is used derogatorily. In 'Selma,' it was the same sort of thing. Of course now, in music, it's used in many more ways, including ways that takes the sting out of it. It all depends on where and when it is used, and how you look at it. But again in 'Race,' it is intensely disrespectful.