HAMMER
Fred Williamson starred in a number of those so-called "blaxploitation" films. One of my favorites of all time is called "Hammer". It's about a boxer who fights his way to the title having to deal with the mob along the way. In the movie, the mob chief has this white girl he likes to treat like shit. Like white meat. Well, she takes a liking to Hammer and tries to get with the black. I remember a great line where she is sobbing because she wants to be with Hammer, and she SCREAMS, "I'll be your black!!!" I think this movie might fit your requirements KKK Girl. I tried to see if I could find it for free online somewhere, but I didn't have much time to search for it today. The treatment of the white bitch may not be as harsh as you would like, but remember that this film was made in 1972. A much more tame time when compared to what we can see in movies today.
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Here's Williamson (and Jim Brown) in another movie, but I don't know which one:
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And here's a nice source of information on the blaxploitation genre in general:
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REMEMBER, IF YOU WANT TO KNOW ABOUT BLAXPLOITATION FILMS, ASK AN EXPERT . . . ASK A black . . . ASK YOUR black :-*