There is no such thing as "white" culture or history.
How can we discuss the significance of the Federalist Papers with our grandchildren if their time in history class is taken up with iterations of the "white" man as the evil overseer, exploiter, and owner? Every culture has its rough spots, the 'white' American melting pot is no different.
But, pray tell, how can you have "Black" history, "Gay/Lesbian" history, etc., and not have "white" history--if in no other regard than the bias with which it (allegedly?) is presented.
When you teach that George Washington was a slaveowning rich white farmer, and ignore the remainder of his life, except perhaps the 'cherry tree incident', then you show cultural bias.
While you claim there is no "white" culture or history, there is certainly an anti-"white" culture and history, largely fomented and perpetuated by the same folks who would balkanize America along racial or cultural lines, and who mercilessly milk those divisions for money, votes, and power.
Racism flies the flag of 'diversity' now, but only for the state-approved. "White" folks need not apply?