I Wish I Knew How To Force John Gibson To Quit

I'm not easily offended, but I'm trying to find the "joke" in Fox News host John Gibson's remarks about the death of Heath Ledger:

Playing an audio clip of the iconic quote, “I wish I knew how to quit you” from Ledger’s gay romance movie Brokeback Mountain, Gibson disdainfully quipped, “Well, he found out how to quit you.” Laughing, Gibson then played another clip from Brokeback Mountain in which Ledger said, “We’re dead,” followed by his own, mocking “We’re dead” before playing the clip again.

When did John Gibson become a shock jock? And why is anyone still paying him?