Abraham H. Foxman, national director of the Anti-Defamation League, called Gibson's apology "unremorseful and insufficient." Prominent Hollywood talent agent Ari Emanuel called for an industry boycott of Gibson in a blog posted Monday.

"At a time of escalating tensions in the world, the entertainment industry cannot idly stand by and allow Mel Gibson to get away with such tragically inflammatory statements," he wrote. "People in the entertainment community, whether Jew or gentile, need to demonstrate that they understand how much is at stake in this by professionally shunning Mel Gibson and refusing to work with him, even if it means a sacrifice to their bottom line.

"There are times in history when standing up against bigotry and racism is more important than money."