That type of behavior is representative of someone with an anger problem. And you're right this could also be chalked up to someone, anyone, having a bad day. But in this case (as you described) he was doing an interview and is for all intents and purposes retired and having a great time being toast of the startup town. He's didn't just get fired from HP or anything. (And of course what you described is what I did experience.)

But that video appears to have vanished. If you can find a link I'd like to see it.