Is negritude a mental illness?

No, negritude is not a mental illness.

It was a Franco-phone literary movement in French Colonial Africa and the French speaking West Indies that began in the 1930's, and rejected racist French cultural attitudes and celebrated negritude which, to be polite, we will translate as "Blackness." The author's of the movement were intentionally using a derogatory term in the name of their movement (as, for example, Richard Pryor would do in America by trying to disarm the "n word" in the 1960's and 70's) to expose the ridiculousness of it.