Most sicilians are looking down at neapolitans, they say they are "mariuoli" which means "thieves", and they say calabresi are particularly stubborn. In fact in Sicily when you call a guy "testa i calabrisi" it means that he is stubborn.
What are other stereotypes for the different regions?
My grandmother and mother are Calabrese-American, as am I. My grandmother is in her mid 90s, and my mother jokes that "being stubborn is what kept her alive that long".
I remember growing up one year my grandmother came for Thanksgiving and she was not happy that my mother did not allow her to cook the Thanksgiving day dinner, or help cook at all. During the meal she said something like, "The turkey tastes OK but it needs more salt."
