Unfortunately they're not all "fair fights."
If I have one tip on this subject it's this: while a whitefella will typically bluff that he's going to punch you in the fucking head or words to that effect, when a blackfella says he is going to hit you, he WILL hit you, and it might be later on and it might be from behind. You will not talk him out of it.
Unless you want a public boxing match there and then, leave the scene immediately. I've been on the receiving end of this more than once. And I was just minding my own business.