I get the impression that Rothstein sees Rosetti as a small-time operator with an over-sized self-opinion. He's probably clipped a handful of other bloviating gasbags just like him over the years, far greater men who have treated him far worse. Guys like Rosetti appear quite aggressive in the beginning, but later deemed a mad dog by his peers, who eventually all agree that he should go away quietly in a freak olive oil delivery truck accident.