I agree with Palio di Siena, on both the burka AND with the Negro sentiment.
I don't believe it was a fair analogy.
Any sensible person has reason to be 'offended' (or threatened) by someone wearing garb belonging to the murderous cult of islam. No one, black, or otherwise, as a reason to be offended by the Confederate Flag. The KKK paraded around with the U.S. flag. The Confederate Flag is a reminder of heritage, and those who fought a lost cause for State Rights over Federal domination.