Robert E. Lee chose loyalty for his state of Virginia and against the nation he had previously fought for and swore an oath to. You call him a traitor for doing so.
George Washington chose loyalty for his colony of Virginia and against the British King he had previously fought for and swore an oath to, fighting side by side with British troops in the French and Indian Wars. Do you call Washington a traitor as well?
If your answer is anything other than “but that was different!”, you’ll be able to knock me over with a feather.
General Washington was not in service to the British Crown at the time of the Revolution. Lee was in service to the United States and had been for more than 30 years. Had he not been wearing blue at time of succession I would have no quarrel with his service to the Confederate cause.
Now back at you. Do you, like most, consider Benedict Arnold a traitor? He was wearing Army Blue before he switched to British Red.