The Lee myth. Lee being above slavery, Lee being in fact anti-slavery, is essential to the neo-Confederate argument that it's not about race, it's not about slavery. They've done a very good job of covering up Robert E. Lee's actual positions on this.
In pre-war correspondence, Lee castigated the abolitionists for their political activity, and he never showed any qualms about the social order that he would later defend with arms. He also had a few slaves that he inherited as part of a will agreement, with provisions to emancipate those slaves. But in fact, he dragged his heels in complying with the terms of that will. And he never gave a second thought to the fact that his beloved Arlington mansion was run by slave labor.
[I]if you think that this whole matter can be reduced to whether we should allow the display of the Confederate flag, you really aren't advancing the discussion very far.
Need I remind you that Stone Mountain and Birth of a Nation are also exercises in political correctness for their time, as are the inscriptions on the monuments erected by several southern states in honor of the service of their state’s Confederate forces at Gettysburg?
Ranting about "political correctness" is best read as "I can't really deal with the merits of your interpretation, so I'll deride it largely because it doesn't reinforce my own preferences and prejudices."
The earth belongs to the living, Jefferson once said, and past generations do not have the right to bind future generations to comply with what those past generations chose to remember about the past and how they chose to remember it.