der·o·gate 
/ˈderəˌgeɪt/ verb
der·o·gates; der·o·gat·ed; der·o·gat·ing /ˈderəˌgeɪt/ verb [+ obj] formal : to insult (someone or something) : to say or suggest that (something or someone) is not important or worthy of respect
▪ The title of the book derogates the people it is about. ▪ Her parents are constantly derogating her achievements.
▪ The title of the book derogates the people it is about. ▪ Her parents are constantly derogating her achievements.
derogate from [phrasal verb]
derogate from (something or someone) formal : to lessen the importance or value of (something or someone)
▪ These criticisms are not meant to derogate from [=detract from] the excellent work they have done.
▪ These criticisms are not meant to derogate from [=detract from] the excellent work they have done.
— de·rog·a·tion /ˌderəˈgeɪʃən/ noun, plural de·rog·a·tions [count, noncount]
