Miles wasn't beating on broads in the background of Sketches of Spain.

Marty does seem to unnecessarily and casually insert extreme racism in films that don't need it. What did the Boston busing riots have to do with the rest of The Departed? Why did we have to hear this crazy guy in Shutter Island talking about how he wants to kill all the black people? Did we need to see such a gratuitous lynching in Gangs of New York?

Is Scorsese racist? No idea. A lot of his earlier films deploy racist language very effectively (de-romanticizing gangsters). Lately, it's hard to justify.