In a group of friends, what has been the greatest damage you've seen caused by a misunderstanding? Have you seen something being interpreted as an insult when it arguably wasn't so?

When I was younger two of my best friends hated each other. The reason was that both of them heard, that the other one didn’t like them.

This went on for years until we randomly all met and I brought it up.

Never figured out, who told them this crap.