Is it normal that cowards use gossip as a means of winning arguments?
When you disagree with someone, discussing your disagreement with them seems to be a more honest and moral way to better understand where each other stand. Talking to people who already agree with your opinion and trying to convince them that the first person is "bad" is a very immature, but disturbingly popular means of interacting with the world.
Nobody comes off any wiser, and everyone is worse off.