I've experienced a few email this week where a person wants to point out a mistake someone has made and will cc other people. I have been both the receiver or cc-ed. In all of these cases, it later came out that the sender was misinformed.
Now I think this bothers me for a few reasons. First- it is passive aggressive. Second, it humiliates the person on the receiving end. Third- it doesn't follow Matthew 18 (go first to the person).
It's one of those etiquette things that has just come about in recent times... I'm glad I learned about this while I am younger, so I won't do this later in my life.
This is not to rag on those who sent those emails, but rather a conviction to ensure that I do not do that. Life Lesson #467