The Confederate Flag, or rebel flag, is a symbol. A notorious symbol. And we would be hard-pressed to find anyone who uses that symbol to invoke peace, harmony, or any quality most of us consider good.
The best I can find is States Rights. I am a libertarian, I believe anyone should be able to display whatever intelligent or stupid flag or symbol they want. But I do not believe our government has a right to do so at the expense and disquiet of the governed.
Times are changing.