Last Tuesday, Apatow tweeted, "I hate to say it but I don't have much interest in discussions about america's got talent. I tried. It is just too much synergy. @sternshow."

A mildly critical tweet, all in all. But it sure got under Stern's skin, who kicked off his show Monday with an angry rant about Apatow's criticism and the quality of his last film, "Funny People."

Even though Apatow is a long-term Stern listener, Howard wasn't having it, accusing the director of "whack[ing] me from the side of the head." And saying that if Apatow didn't like what he was hearing, he could go elsewhere.

He also said "Funny People" was "the worst movie ever made."

Following Stern's rant, Apatow responded to fans on Twitter, writing, "It gets blown out of proportion by the press who has nothing to write about and Howard who has time to fill. We all Like Certain parts... I like em all. Just some more than others."

Will that be enough to calm Stern? The host has probably forgotten the feud now that he has bigger matters to fume about. Late Monday, a New York state court judge threw out his lawsuit against Sirius XM that demanded a $300-million stock award, according to the Associated Press.

Stern told listeners on Tuesday that he was really bummed about the decision and plans to appeal.