Toni Morrison is challenged regularly because she is a black author who writes about the real world. She speaks with so much knowledge about black issues she can't be accused of creating these (issues). People find these issues threatening.
"Group Targets Black Authors' Books; Toni Morrison's Novel Deemed 'Smut' by Parent; Acclaimed Memoir 'Black Boy' Also is Under Fire" by Valerie Olander, The Detroit News, January 24, 2007.