I was rude to someone in a staff meeting once. We worked a trouble desk for computer problems that other people in the company would call (not the public). We had a woman in the meeting who was whiney all the time and no one liked her. She was complaining about the people in those other offices.
"Sometimes they treat you like you have a brain the size of a pea!"
Then I took advantage of the opening. "Well in your case, Wilma..." and didn't finish.
Even the manager laughed, and I didn't get a reprimand. I did apologize as it hurt her feelings.