DEAR MISS MANNERS: Is it ever possible to be too polite?

GENTLE READER: When politeness is used to show up other people, it is reclassified as rudeness. Thus it is technically impossible to be too polite.

Judith Martin (b. 1938) American author, journalist, etiquette expert [a.k.a. Miss Manners]

Miss Manners Rescues Civilization, ch. 13 “Tradition Moves Ahead” (1996)
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"Miss Manners's Parting Shot." Concluding words of the book.