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There's always room for discussion, but perhaps these previous topics found through the search function will answer your inquiry.
when was it first suggested black racial slurs like were offensive?
Was "nigger" a insulting way to address blacks, our was it just what white people called blacks?
When did the term 'nigger' start being regarded as offensive?
When did the word "nigger" start being commonly (publicly?) referred to as the "n-word"?
At what point did 'Negro' become an unacceptable term for African-Americans?