Does it end?

Does the school bitchiness ever end? I'm I'm my twenties and some people still go around bitching and slagging people off. I've seen full grown women in their 60s doing it. I was at work and a supervisor made one of my colleagues upset after humiliating her in front of everyone in a meeting simply because she doesn't like her, it was over the pettiest thing as well! I was so shocked and so was other people in the meeting. I don't understand how people can still get away with playground childish behaviour