Political correctness has been taken too far.
The Marxist have hijacked American history and dumbed us all down to the level of their minions. "Rebel" offends those who view the American Civil War solely through the prism of slavery.
The slavery only argument is overly simplistic and ignores several factors....
*** Mississippi never declared war on the federal government, the federal government made war on Mississippi.
*** Slavery itself was only a component of the true cause of the war which was the ongoing power struggle between the central government versus the state.
*** Sherman's march to the sea, among other war crimes vindicated the Southerners who favored secession. They feared the federal government would be hijacked by a radical element and they were proved correct.
There were no Union casualties during the firing on of Fort Sumter. The first blood was on Lincoln's hands when he invaded the sovereign state of Virgina.
*** The party of Lincoln was not egalitarian and had no interest in fighting a war for such aims as the slavery only argument claims. Tell native Americans how egalitarian the Republicans were in the 19th century.
Thomas Jefferson's grandsons were Rebels, not Yankees. ( Davis' Sectary of War 1862). Many claim the North's war was to uphold Jefferson's ideal of all men created equal. not so !
*** At the very beginning Lincoln made it clear that war's aim was preserve the Union, not end slavery. The "slavery only" crowd have to claim Lincoln reached an epiphany mid-war to make abolition a cause.
*** The federal government more or less abandoned the US Constitution in the war. We were an republic at the time and in a republic states have rights. Again vindicating the Southern secessionist fears. Habeas Carpus was denied, those who disagreed with Lincoln jailed, special war powers proclaimed. States invaded...property destroyed.
*** after the war, few in the North actually wanted these freedmen. Why fight a war for someone you want nothing to do with?
*** Those who proclaim the Southern leaders as tyrants or radicals never read much on the founding fathers of the USA.
To deny the South their collective memory of the American Civil War is nothing short a bigotry.