Phony in Chief

You know, I get that "white N-word" is meant to be an insult, but what does it mean? The urban black culture is so bereft of nuance and education that apparently they have only a few words with which to insult or compliment one another with (the urban black vocabulary is pretty sparse, in other words). Does the N-word perform double duty in this way, or is it "White" that Snoop considers the insult? That's a lot like shouting "You tall, dude!" at a tall person, but, whatever. I await the comments of those more experienced in interpreting urban black culture and its vocal tics..