I’m aware of it but only through seeing folks online in comments (and generally they are folks not from the south) making me aware of it despite living in the the south for half a century.

No one I know down here wastes two brain cells dwelling on or “upset over the loss” from a war fought 160 years ago, but to read it online you’d think every other home has an altar to Robert E. Lee in a special alcove in their living room.