It is rude to be negative about your girlfriends mother.
Jim and Zoe are having dinner at his girlfriends parents house and the mom tells Jim his tattoo's make him look like a punk.
Jim wants to react to the situation.
Jim makes a joke by saying that he loves punk music, so thank you for the compliment.
Jim tells Zoe's mom that her dress makes her look overweight.
Zoe thinks Jim is witty and everyone at the dinner table laughs it off.
Zoe is angry that Jim said that, and they end up in an argument.