In nonpublic and limited/designated public forums, the display of an enemy battle flag need not be declared sacrosanct. Note: the blue saltire cross on red field flag of the CSA is not the actual flag of the CSA (that's the flag of Georgia minus the state seal). If a state flag displays either flag, let the Court decide which priority overrides. But generally, no, the rebel flag shouldn't enjoy protection when it falls under the category of 'government speech.'