I had friends that used it in the early 70s. Whenever a fight broke out among us, they would shout out "Fight, fight, n***** and a white". I never thought it was funny and knew it was wrong. I don't know whether that was a common expression at the time or whether it was just them. I had some friends from weak familiies. My house was was the main gathering place for my group of friends. I figured out out later it was because my parents were nice to them.