Miss Manners: How should I have handled my incredibly rude houseguest?

A host sought advice from Miss Manners after a first-time houseguest repeatedly mocked their home. Following five comments regarding clutter, the host responded to the constant negative remarks about their beloved space by repeating the guest's last comment back to her. This response included a sarcastic thank you for the gratuitous input. Judith Martin, Nicholas Ivor Martin, and Jacobina Martin provided guidance on how to handle this incredibly rude behavior and the resulting social tension.