Easy solution.
The logical step would be for people to cease entertaining these people, byt for whatever reason, people enjoy going back and forth over rehashed bullshyt.
So simply restrict the users with a history of fabricating these sorts of threads.
Restrict their posting privileges and isolate them within The Race Track.
That's what the forum is there for. Since the mods are hesitant to drop ban hammers on blatant trolls that add absolutely nothing to the board for fear of being likened to SOHH, simply keep them away in their own bubble.
They're free to create all the black males vs black female threads they desire in The Race Track, and everyone else is free to engage in discourse without their threads dragging down the quality of the board.