You make a good point. I was thinking along those lines today, without the historic underpinning: the left has been vilifying the United States for so viciously and for so long they are not far from wanting the US flag to go as well.
Before he was killed in the final five months of the war General Patrick Cleburne predicted how the South would be portrayed...
“Every man should endeavor to understand the meaning of subjugation before it is too late... It means the history of this heroic struggle will be written by the enemy; that our youth will be trained by Northern schoolteachers; will learn from Northern school books their version of the war; will be impressed by the influences of history and education to regard our gallant dead as traitors, and our maimed veterans as fit objects for derision... It is said slavery is all we are fighting for, and if we give it up we give up all. Even if this were true, which we deny, slavery is not all our enemies are fighting for. It is merely the pretense to establish sectional superiority and a more centralized form of government, and to deprive us of our rights and liberties.” – Patrick Cleburne, CSA