Gossip. I hate it. It's the little insulting comments that are made about someone behind their back, and makes up for a large portion of all personal drama. There are so many things wrong with this. First, if there's something you don't like about someone, go straight to them and try to work it out, or otherwise, keep it to yourself. Gossip is just cowardly. And not only that, if you let someone gossip to you, you're just feeding the problem. If someone is willing to gossip to you, they will most likely also gossip about you. It's just a pointless, destructive habit that brings down the gossiper and everyone gossiped about into a downward spiral.
If you gossip about someone, chances are you don't realize how much that can damage them. It shows that they are worth so little that you can critisize them any which way you like. It's insensitive and makes you look like a jerk, plain and simple.
I know that was pretty short, but that's all I can think to say about it at this point.