Ali really disliked Don King.
The press made it look worst than it was between him and King. King was and still is a hated promoter because of the color of his skin. Yes, I know that he is no angel, but King has put more money in the pockets of black fighters/managers/cut men/referees than any white promoter has ever done in the history of the sport. Ali did love the fact that Don King always made surrounding black businesses a crap load of money during events.