NEW YORK — They told you once and they told you twice. The National Review has warned its readers to stay away from black men.

In a column titled “Facing Facts About Race,” National Review writer and military historian Victor Davis Hanson explained how racism is passed from generation to generation of men in his family.

He begins by sharing his father’s warnings about “black youths” before claiming, “the advice was not about race per se, but instead about the tendency of males of one particular age and race to commit an inordinate amount of violent crime.”

Next, he let readers in on his own racist child rearing. “It was after some first-hand episodes with young African-American males that I offered a similar lecture to my own son. The advice was born out of experience rather than subjective stereotyping.”

Finally, Hanson laments, “I expect that my son already has his own warnings prepared to pass on to his own future children.”

The column comes only a year after National Review columnist John Derbyshire posted a 15-point plan to help his children avoid black people. Derbyshire’s letter included such advice as, “If you are at some public event in which the number of blacks suddenly swells, leave as quickly as possible.”