It is bad to intentionally say things to offend people
David is talking with a group of friends when Joe is walking nearby and drops a stack of books.
David wants to impress his group of friends.
David rushes over to help Joe pick up his books for him.
David loudly laughs and points at Joe and calls him clumsy.
Joe is thankful for the help and continues on his way.
Joe's feeling are hurt, and he picks up his books.