Morgan Bullock is rightly being championed for her dancing skills.
I think she would probably not have 'gone viral' in quite such a same way were it not for the fact that she is African American in a tradition predominantly practiced by white dancers. To say so is certainly not a complaint, nor any disparaging comment on her abilities.

On the contrary, right now that's exactly what race relations need. We'll know that racism no longer exists by the fact that such things cease to be worthy of comment by anyone.

However, white people are correct in being self-aware over how the words they use. The guy on the phone from Riverdance heard in one of the videos above edges over into being a little condescending.