You should be polite to a parents partner.
Andrew is visiting his girlfriend Linda's parents for dinner, but Linda's family cooked his least favorite food.
Andrew wants to make conversation over dinner.
Andrew makes conversation about the weather and his job while trying a small portion of the food.
Andrew complains that he has never liked this type of food and announces that he will be stopping at McDonald's on the way home.
Linda's parents immediately like Andrew, and they invite him to another upcoming family event.
Linda's parents dislike Andrew and discourage Linda from continuing to date him.