Having a mean boss is sometimes an occupational hazard. Bosses that are harsh in tone, reprimand you in front of others, or just overall abusive, may be able to improve their attitude simply by exercising.
Have you seen previews for the new comedy Horrible Bosses? Everyone has them at some point in their career. At this moment I don’t, but I’ve worked for some before. At least the movie made bad bosses look fun, but for many people, having a bad boss isn't a laughing matter. It's a fact of life.