For someone who espouses grand principles (Rework), David is taking the low road with his petulant ad hominum attacks. Calling Ballmer's stage presence uncool is a little disingenuous when it's clear that Ballmer was just being himself and trying to get his lethargic team pumped up. Before casting too many more stones, David should reread his mentor Kathy Sierra's post about how unhappy people drag down the level of discourse.