It's a funny point. If I were having some argument with the neighbor and the plumber gave me shit about it...to be honest, I'd be super-annoyed and while I wouldn't fire the plumber (it's difficult to get plumbers on site!), I probably wouldn't have him back.

Your point is a good one though, to continue the analogy, the plumber shouldn't want to come back. Erratic and volatile bosses are best avoided. I prefer it when they do this stuff loudly and in public so I can know to avoid them.