LOL! Yeah, I feel your pain. Ive been listening to the same Lost Cause mythology for a couple of decades. Abandoned debating them long ago. They are impervious to fact and evidence and come out of the woodwork when their careful constructed world is threatened.
True-my Dad never discussed it-never win. We took my son to the local museum in Kennesaw GA. He was about six...as we were leaving he talked about the South winning the war...we laughed and told him the truth...but if all you knew is what was presented at the museum...you would believe the South won.