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The act of humiliating another person by criticizing them about their poor or supposedly poor manners in front of other people.

Sometimes, it is done to a person who really has poor manners. Other times, it is done by one person to another who does not necessarily have any problematic manners simply for the sake of causing the victim pain or anguish, or to take out anger or get revenge on the victim.
I cannot stand being around my mother-in-law. She is always manner bashing me.
by Bed time April 28, 2010