well, regardless of how I feel about Ballmer's blatantly unprofessional nature, it does sound like he was just trying to make a joke out of this... unfortunately, though, he's got a long track record of immature behavior, which I'm sure is a reason that people would take his actions in this situation out of context.
If the boss of your company, a person who can fire you any time he likes (and who has the lawyers to get away with it even if it is illegal) takes your phone and pretends to destroy it, that is bullying. Plain and simple bullying. So there is this big guy, running the biggest software company in the world, has billions in the bank, and all he is is a ******* bully who can't handle a bit of competition. No wonder that the whole company is the same, if that is what their leadership does.