To be fair, she has had a steady stream of Tweets going back to 2014 that were pretty unambiguously racist (or if you're of the "you can't be racist against white people" persuasion, some other term that means something like "anti-white"), so you could be forgiven for mistaking the context in this one case.
The latter half of my comment deals with this - hint: I'm not opposed to people being given a chance to explain, or being charitable and permissive to all speech.
I was aware of the original tweet a few years ago, but didn't know the context until now.
I haven't read the referenced article so I can't comment on whether it's a valid criticism or not. But it's clearly satirical.