It's rude to make fun of your friend.
Paula and her friend are shopping, and her friend tries on a dress that doesn't flatter her.
Paula wants to prevent her friend from buying the unflattering dress.
Paula tells her friend that the dress is not right for her and offers to help her find a more flattering one.
Paula mocks her friend's appearance, calling her ugly and lumpy in the ill-fitting dress.
Paula's friend takes the advice and ends up finding a dress that looks great on her instead.
Paula's friend is hurt terribly and leaves the shop in tears without buying anything.