This struck me funny because, if you watch the clip at Zap2it.com, linked above, you'll see he uses the f-word as commonly accepted slang for "Forget it." He doesn't say it in anger or malice; he says it in good-natured jest. If he used another expletive, perhaps that would be one he shouldn't have used.
A collective morality can't be applied because profanity is generally allowed on other programs the same audience may be watching. Microphones often pick it up during games. We can't and shouldn't take language out of context but address the intent behind it. Ultimately, one can only decide morality for oneself.