I think he has a right to be pissed there, but he clearly does not know Cronenberg that well if he thinks he is a "Hollywood type." Cronenberg has made a grand total of 1 movie for Hollywood, and even that movie (A History of Violence) was filmed mainly with Canadian funding.
And if this pissed Rosenbaum off so much, why didn't he contact Cronenberg about it when it was relevant? That's what he's REALLY pissed off about, that Cronenberg spoke his mind, when he himself took it like a bitch.