It's rude to ruin people's reputations.
Nicole is upset with a coworker who caused her to have more work.
Nicole wants to make sure the coworker doesn't mess up again.
Nicole has a discussion with the coworker explaining the mistake they made and showing them how to avoid it in the future.
Nicole spreads a rumor about the coworker to the rest of the coworkers so nobody works with them again.
Nicole's coworker is grateful for the tips and is motivated to avoid the mistake in the future.
The coworker notices everybody avoiding them and feels like an outcast.