You shouldn't get in arguments with your in-laws.
John is having dinner with his in-laws, and they express a political view that he disagrees with.
John wants to respond to his in-laws statement.
John acknowledges his in-laws' point of view and then expresses his own in a respectful manner.
John criticizes his in-laws' point of view and starts a heated political argument with them.
Everyone continues to get along well, and they enjoy the rest of their evening.
Everyone gets angry and the dinner is ruined because of the argument.