I'll need to find it but one of my books on Hoods Texas Brigade mentions Union troops being especially hostile to confederate troops from SC. I believe the anecdote was during the siege of Petersburg where the Texans and other CS troops were allowed a more live and let live policy across from the Federals but no such invitation was extended to SC troops, as they were who the Fed. troops blamed for starting the war
(not Petersburg but around Chattanooga) so some the same
Men who would be with Sherman during the March to the sea.
"The Texans ignored official policy altogether, arranging truces with Federal pickets along their section of the line. They agreed not to shoot at one anotherso as not to waste powder and shot and force the inconvenience of a round-the-clock alert on anyone. Jenkins' South Carolinians, posted to the immediate left of the Texans, had no such truce with the Federals. Thus the peculiar sight of Carolinians hiding in their rifle pits or behind trees, while not more than 50 feet away, Texans stretched out on blankets enjoying the sunshine or playing poker in the open, within 100 yards of their enemy."
From "The Bloody Fifth; The Fifth Texas Infantry Regiment, Hoods Texas Brigade, The Army of Northern Virginia" by John M Schmutz