What I learned was that these gentlemen were entirely comfortable with their U.S. identity. They did not pine for the Confederacy to rise again. They did not blame the U.S. military for Confederate wartime deaths. There was no anger in connection with Sherman’s march, and the destruction of southern cities, farms, infrastructure, and other public & private property. So what exactly did bother them–what precisely was their beef? It was The Battle Hymn of the Republic. It upset them to no end. I was young then. Perhaps, I should have understood why it upset them so much. In my defence, I can say, after some years (decades) of reflection, I figured it out.
Interesting thoughts. More here.