Alice, My Sister Mocks My Home and Refuses to Visit -- Ask Alice: Advice for Life at Home

Dear Alice, My husband and I live in a small (800 square foot) bungalow. My sister and her family refuse to come visit us because, "my house is too small" and will insult my home at every opportunity. She dismisses my hurt feelings because "it's not insulting if it's true." What can I do? Help! Sincerely, Bungalow Blues