Big difference. The Jews never tried to revolt against Germany. All they did to earn the “erasure” of their history and culture by the Nazis was simply to exist.
Nobody is trying to wipe out the Civil War from the pages of our history as if it never happened. But the racism that triggered that war doesn’t deserve to be flaunted with pride. Such history belongs only in a museum and in our history books, and shown for what it was.
There is plenty in the Southern culture to take pride in. Racism is not one of those things. And no matter how much you protest to the contrary, the war was fought to preserve the institution of slavery, an institution that was racist to its core.