Out of curiosity, what are we supposed to infer about someone when she is described as "a visibly angry White woman"?
I'd quote the entire passage, but the book is en route back from the midwest. I think the phrase you quote, though, is a quote from the book.
The situation was that Dr. Tatum was speaking to a professional group about racial identity. The person introducing her said that the following morning there would be a special breakfast for PoC attendees of the conference.
That's all the context I can provide at this point in time. If you're interested, I'd be happy to lend you the book when it gets here.