She's the person who tweeted “Going to Africa. Hope I don’t get AIDS. Just kidding. I’m white!”

From the author of the article:

  I began to suspect that it wasn’t racist 
  but a reflexive critique of white privilege — 
  on our tendency to naïvely imagine ourselves 
  immune from life’s horrors.

Yes. I make Sacco's kind of joke all the time (in private), and it's also meant to be a comment on racism itself. This kind of joke was common in the late 70s and early 80s (see movies like "Blazing Saddles" or Richard Pryor's "Live on Sunset Strip". In those days anyone was allowed to satirize racism that way, black or white. I think it was healthy, because it robbed racism of its power, sort of like saying Voldemort's name. Now... not such much.