It wasn't but scenes like this did happen a lot back in the Jim Crow South. What did you want Ellison to do, gloss over conditions that existed back them? BTW, a lot of liberals would have you believe that conditions for blacks haven't changed since then. However, they did change for the better....DRAMATICALLY. Sorry if you were offended by those scenes but that was the reality of the South (and to some extent the North) back about 70 years ago.
Another factor for me is writing style. The style in which the book is written rather grates on me.
All that aside, I will try and work my way through the book, and give it another chance.