…that he was doing wrong in rigging himself out in that fashion, as it was an indecorous thing for a priest to dress himself that way even though much might depend upon it; and saying so to the barber he begged him to change dresses, as it was fitter he should be the distressed damsel, while he himself would play the squire’s part, which would be less derogatory to his dignity; otherwise he was resolved to have nothing more to do with the matter, and let the devil take Don Quixote.
There are no more uses of "derogatory" in the book.
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It is unacceptable to use derogatory terms to reference a race or ethnicity.
She made a number of derogatory comments and left the meeting.