Some People are so Immature

I don't understand how a person can sit there and make fun of someone for something that could be said about them as well. People seriously need to grow up. Since when is it cool to sit around and talk about everyone that walks by? Its ridiculous. How can you sit there and make fun of someone, when you have the same problem? Like really?! Do you even realize how you would feel if someone said that about you? Think about it.