I never heard of what you reference.
John Derbyshire responded to a racist article wherein a black mother supposedly had to sit her black teen son down and give him a talk about how unfair the world is to blacks and how he was a target for racist white cops and racist white people in general.
It was entitled “The Talk”; it was laughable.
What Derbyshire did was write an article called “The Talk, for White People”, wherein he laid out rules to survive black violence.
One rule was “If you are in a public place and suddenly find yourself surrounded by many blacks, leave the area immediately”.
Another rule was “Do not frequent public places known to attract large numbers of black people”.
So yeah, common sense, But it riled leftists and got him fired.
Everyone should read his “Rules”; it has the power to save thousands of lives.