In south FL we used to call Cubans, Puerto Ricans, and vice versa. It was especially good to call the one that in front of a group of the other. I caused a full-on melee in a shop class once by casually saying to a Cuban kid: "Wait, you're Puerto Rican aren't you?" within earshot of a bunch of PRs. The Cuban flashed indignant and before he knew it his words drew the PRs like blowflies to a carcass and then the Cubans came to his aid and I just walked over to a corner of the shop and watched. Good times.