I get how in general NY look down upon the DeCavalcantes, considering two (you can argued three) of the Five Families' Jersey factions alone have more manpower, presence and power over the Dimeo/Soprano (opps...I mean DeCavalcante :p) Family.
Although, it must be said that not all wiseguys from the DeCavalcantes are treated as inferior. In fact, some were feared even by NY wiseguys. I recalled reading an article about Vinny Ocean where he scared Joe Colombo's son (who is a made guy) and made him backed down over a dispute. However, we are talking about Joe Colombo's son here, who made "Godfather III" before Godfather III was out and also the same one got beat up by Sammy Gravano.