Why?

Why do girls have to try and tear each other apart? I'm watching Odd Girl Out and it made me begin thinking. Why do girls have to bring each other down and hurt each other in the worst ways possible? There is no sense at all in people treating each other like that. If you don't like a person, just don't associate with them. Don't talk crap behind their back. If you have anything to say to someone, please please please say it to their face; because, frankly, if you say it behind their back, it will more than likely get twisted and convulted before it reaches their ears. Then, you have an even worse problem. And if you have opinion about someone, either tell them nicely or just keep it to yourself. Have tact! (haha Ms Shields, I said it! lol) And the problem isn't only with girls. A lot of guys have drama too. Some of them can be worse than girls!! I think it depends all on a person's personality. Let's all take a vow to be honest with each other and tell each other our honest opinion: but use tact!!