I've always saw that as the NAACP showing their blatant ignorance about history. The confederate flag represents a number of things other than slavery. Hell, given Lincoln's quote that if keeping slavery as an institution would keep the US together as an entity, he would have had no qualms about it. Looks like the Stars and Stripes can now be qualified as a symbol of slavery...

Anyone that's read more than a pop-up book on the Civil War should know that state's rights was the MAIN cause behind it. The bickering back and forth between many of the Southern States and the Federal Government at that time was something that spanned DECADES before the start of the war. Slavery was a polarizing issue between a number of states and later on the the two governments, yes, but not the main one, though it's the one that gets the most press in middle and high-school texts, due to it's simplicity in representation and explaination of the events that occured around that time. As usual, there are TONS of details that get left out that otherwise would give a more complete picture of what the Civil War was REALLY about, and it didn't revolve around slavery. Period.
State's rights, southern pride, the farming/cropping lifestyle, etc., etc., taking a stand against an overbearing and encroaching Federal Government, etc., etc., the list goes on and on. If anyone thinks that simply because the Mason-Dixon Line supposedly seperated where the Confederate flag and the Stars and Stripes were flown and that those boundaries are absolutes, they are NUTS! Delaware was a STRONG proponent of the Confederacy and it's ideals. Certain states were neutral in the matter (i.e., Kentucky), though got drug into the entire mess when troops were sent into their borders. That's what pushed Kentucky to the Union side is Confederate troops invading their State, not their position on slavery...
I know what the NAACP is trying to sell to the rest of the population and I know why, as they are an institution that is clinging on to any issue they can, simply to further their survivial as a relevant and meaningful organization in a time that has mostly passed them by. They are another bureaucracy. I'm not a fan of make-believe or revisionist history because it's an insult to the well-known recorded and verified FACTS at hand. They are raping the true meaning of that symbol and unfortunately they are succeed in doing so, mostly with the ignorance of the general population in this country...
BTW, it's really hard to compare the Nazi flag with the Confederate flag, given that the genocide of segment of the population wasn't a goal of the Confederacy at any point in time. The aims and goals were totally different. Nazi Germany aimed to conquer and control everything they touched. Bigotry, hatred and elitism were truly the backbones of the Nazi movement. The Confederacy wanted to be left alone and have greater control over their own political structures, trade and commerce and laws. Slavery wasn't a viable issue and difference that polarized Noth and South until it was created into one.