The thing about material that contains racist language, is that it falls into two categories

a) the author/narrator is deliberately using the racist language to criticise/draw attention to racism in order to encourage the reader to become less racist and/or to say to readers who experience being the targets of racism "I see you, and what you experience is NOT OKAY and you deserve better"

b) the author/narrator is using the racist language either unconciously/unexaminedly or because they actively endorse racism.

I have no trouble with books in b) being banned by school boards,

but books/films in a) ABSOLUTELY belong in schools if otherwise age appropriate.