All Confederate flags, including the Confederate battle flag which is the topic of heated debates at this time, are symbols of the government of the Confederate States of America. When you look at that flag you must remember why it exists. Here are the words of the CSA vice president, Alexander Stephens, on the occasion of the ratification of the CSA constitution in 1861...
"[The Confederacy’s] foundations are laid, its cornerstone rests, upon the great truth that the negro is not equal to the white man; that slavery, subordination to the superior race, is his natural and normal condition..."
------Many of the Southern state's Articles of Secession mention that their reason for seceding is that their right to enslave and subjugate the black race has been infringed upon. So when people say that a confederate flag is about states' rights, you will know to what right they are referring.