There is indeed a rivalry between Sicilians and Neapolitans. Now it's more subtle than anything else at least in this country as each group has gotten Americanized. The Barise talk fast like chickens, the Neapolitans are "Mariols" or thieves, the Calabrese are "Capo Dost" or hard headed and stubborn, the Sicilians are hot heads, and ALL the Southern Italians talk ish about the Northern Italians for thinking their ish doesn;t stink lol and the Northerners look down on all the Southern Italians as peasants. Italy was not a unified country until the mid 19th Century. It's kind of like how before the American Civil War people saw themselves as New Yorkers or Virginians as opposed to as Americans. There is that famous statement with Sophia Loren when she was asked by an interviewer if she was proud to be Italian and she said basically 'I am not Italian, I am Neapolitan that is something different'....