There's a rivalry between every region in Italy. The thing that I've always hated was when people ask if someone is sicilian or italian. You never see anyone ask if someone is neapolitan or italian. But anyway, there's more of a rivalry between southern italy and northern italy. But I've never seen that much of a difference between Sicily and other southern regions of Italy. People always say there's a huge difference but I've been to Italy and I've lived in America all my life and I've never seen a difference between most southern italian Americans and southern Italians in italy whether they're neapolitan, calabrese, or sicilian.