It is never acceptable to swear at someone serving food.
Karen is dining out with her family when her order is not done accurately.
Karen wants to get the correct order.
Karen points out the mistake in the order and asks if anything can be done.
Karen uses expletives in a voice that is audible to customers around them while questionsing the competence of the waiter.
Karen is given the correct order and comped a free dessert because of the mistake.
Karen is approached by the manager and asked to leave after other customers complain about her behavior.