Are things that represent the Taliban racist because of the Hazara genocide?
Are things that represent Pol Pot racist because he committed genocide against ethnic Chinese in Cambodia?
更新1:
I don't justify slavery, but if the Confederate flag is bad, then those other things have to be bad too. So if the Confederate flag is offensive to blacks, then the Nazi flag is offensive to Jews, Slavs, Gypsies, Jehovah's Witnesses, and homeschoolers. Taliban symbols are then offensive to Hazaras. And so on.