I had that happen to me on the Community Board. The "coconut" thing.
The OP of a thread posted comments attributed to themselves, when it was actually comments from an online article. When others made comments suggesting quoting a source (myself included), we did so in a nice way. The OP sounded like a kid who didn't have the maturity to say, "That makes sense, live and learn." Instead, he or she had to get on the defensive, turning around and making us look like we were horrible people for "attacking" him/her.
Such is life online. It's easier to be mean and nasty when you're hiding behind the anonymity of a keyboard than it is to be mean and nasty to someone's face. That's the way it's always been and will continue to be.