Social tone.
It’s easy to be witty at the expense of someone else. Now, it’s far more difficult to say something that uplifts and enlarges others. But it’s a far better idea. That’s why we appreciate a good tone amongst ourselves. And attempt to at least maintain a certain level of decency and kindness. Even under duress, PMS, and frightfully early in the morning. It almost goes without saying that occasionally we succumb to doing a Captain Haddock, and curse and swear at each other.