I'd say the evidence is widespread, in the simple comments one makes, the jokes told, the subconscious aversion when someone "different" walks along the same sidewalks or buildings, the stereotypes perpetuated on TV, etc. It's not something we're really aware of unless we actively try to think about it. It is, unfortunately, way too easy to overlook even with the media coverage of prejudicial affairs.

As for her comments, yes they are combative, but can one be racist when they don't have the full force of a social system behind prejudicial thoughts? That's been her point in several posts, when she's not lambasting someone for callous remarks by using heated rhetoric in return.