Similar thing, but I was the accused. Asian fellow was calling me a soft, southern poofta because of my accent. I asked him what nationality he was , and he went ape-shit, calling me a white, pork-eating racist. When I tried to tell him that he had made racist comments at me, he told me I was white and couldn't be racially insulted! He kept calling me a racist until I kicked him in the ballsWhat strikes me is it's a one-sided story without a full response from the other side.
Call me cynical but I can think of someone very close to me who was accused (entirely untruthfully) of racism at work. The company's initial response to try and persuade the two 'accused' to apologise. It was only when they said 'no way' that the company did the right thing and started to take their objections seriously.
The underlying story was that the woman who made the accusation was failing in her job and trying to divert from that. She eventually left. However, the reaction of many organisations when faced with a race issue is to act like a rabbit in the headlights.
I'm not saying one way or another in this case but I don't see a right to reply from those she dealt directly. One person's story is presented as fact and largely unchallenged.