Sky Sports during Indian Wells has been running ads for...um...a car, I think, in which John McEnroe fights with a traffic warden over a "line call" -- that is, whether or not his car is parked within the legal lines. I guess we're supposed to be amused at the notion that either a) McEnroe is genuinely just like that all the time or b) that he is self-aware enough to make fun of himself. The ultimate impression, though, is neither: just an old, tired act that's been played many too many times. McEnroe may have grown up enough to recognize that it was bad behavior; if so, the right thing to do now is to Stop Making Money Off It.
wg
I wasn't watching tennis when McEnroe staged the original tantrum, though I get the impression he did them to psych himself up as much as he did to disrupt his opponents and express genuine anger. (It's often been commented upon that he tended to behave far better when he was playing opponents he truly respected, such as Borg, et al. I believe this was because the thought of losing to them bore no shame, and also because he didn't need to psych himself up for the really great occasions.) I think a lot of the pompous criticism of them was windbaggery, though: McEnroe's and Connors' bad behavior (and great play) brought an electricity to the game that has rarely been seen since. Nonetheless, that was then and this is now.