The historical revisionism of the Confederacy is the real kicker. Almost everyone probably has at least a few ancestors that ended up on the wrong side of history but most normal folks can accept it. The whole trying to defend being on the wrong side of history and glorifying what that ancestor did is a problem.
Many of the Confederate monuments were also a direct message of 'know your place' to minorities and were erected decades or even a century after the Civil War.
		
		
	 
One of the monuments at Gettysburg stuck with me in regards to the revisionism aspect, but in a way that somehow cut through the BS more than the expected ones. Oddly, it was one of a particular Confederate General.
I mean, I always regarded Confederate monuments as something akin to supervillain monuments; my dad, a history teacher, raised me to have a nuanced view that amounted to understanding why these guys were capable of bravery, ingenuity, determination, and loyalty... but skewed in a way where those were “evil virtues” that required accepting a lie about what slavery was and following it so 
thoroughly that great atrocities, inhumanities, and selfishness “had” to be allowed and condolence on their view lest the lie be revealed and their sins be laid bare.
So I was always uncomfortable around those monuments, and always felt that they represented a great evil more than anything else...
...But it was the small, out of the way, pedestal-less and somewhat surprisingly second-rate statue of CSA General Longstreet at Gettysburg that really hit me regarding just how much of the post-war revisionism was filled with intellectual 
cowardice, not just denial or insidious propaganda - that they really were afraid of the truth, not just trying to hide it.
Longstreet was Lee’s second in command, and basically the second most prolific field general after Stonewall Jackson. Lee called him his “Old War Horse.” He was the commander above Pickett of the famous last charge at Gettysburg, the one that the Lost Cause sought to romanticize as a “High Water Mark” instead of as arguably Lee’s biggest single blunder and a hopeless tactical failure on every level. He’s the perfect candidate for the kind of general the Lost Cause would lionize and worship as a near Demi-god...
...Except 
after the war, he became a Unionist Republican allied with Reconstruction (he was Grant’s best friend and had been his best man at his wedding), opposing the early white supremacy movements and terrorist organizations.
And because this guy, a Confederate among Confederates, a guy you just 
know was integral in not just Lee’s military victories but 
also in this kidnappings and enslavings that Lee’s army perpetrated as the went North, dared to act in a way that admitted the South’s defeat after the war and their cause being wrong, they tried to bury him as a scapegoat.
For some reason, it just highlighted how scared and b****y the Lost Cause was about its content. 
It’s a “history” for snowflakes and crybabies; some of them are monstrous fascists... but that just remind you that fascists can and often just flat out are  snowflakes and crybabies. It’s part and parcel of the whole thing. Their not just the kid who cheats at the game, or the criminal. They’re the guys who whine and cry when they get found out.