Then why not just quit?
He wants to be a smug little martyr.
He has another year left on his contract. If he quit, he would forfeit that. If he's fired, he can threaten an argument that it was unjust and perhaps get CBS to fork over what he's to be paid on the balance of the contract. He essentially forced them to fire him.
Quitting is just quitting. But rage quitting is attention-grabbing drama.