I don't know, I think there are multiple valid perspectives on this one.  I think that, if the singer had notified people ahead of time of her intentions, there would be no controversy.  But, it does sound like the person intended to catch people off guard and to provoke some sort of response by turning a fairly routine and largely meaningless ritual into an ambiguous political statement.  It's easy to see why some would take it as a sign of disrespect, no matter how well the song was sung.  That's the risk someone runs when they decide to do something unexpected and provide no context to outsiders about their actions (I'd never heard of the song or its unofficial title before now), and I suspect that the singer knew that.

Obviously, though, racism has no place in this discussion.