A Build Engine(Duke3D, Ion Furry) or Build Engine style(Cultic) game made around Petey Wheatstraw/Blaxploitation film genre. The "Holly Trinity" of Build Engine games were based on action films, each with their own specific flavor. Duke3D was 80's action, Shadow Warrior was badly dubbed HongKong Action and Blood was westerns and horror.
Blood and Cultic both have robbed cultist that light up real good with a molotov cocktail. I think it would be incredibly satisfying to light up KKK members the same way.
A Blaxploitation game would be rude, crude, and upset a lot of people. It could also be really fun and something that hasn't been done before. Most games that try to tackle racism do it was an attempt at nuanced or preachy writing. I just want to beat a neo-nazi with my pimp cane.
I forgot to mention the One Liners that are in Build Engine style games. I think Cultic is the only one with a silent protagonist, but that was Film Noir/Lovecraft Horror, so it's excusable. One liners like this would fit so well with that style.