The original article is actually about the public perception of royalty figures, more than about Kate. It's a good article and, apart from a little bit of clever clever straining, is well written. What people write is often misinterpreted, or misunderstood, as we've seen sometimes on gransnet. I read the article not as an attack on Kate, but as a modern investigation of what royalty is for nowadays.
What was written, and the pictures made, of Mary Beard are in a different category altogether. Anyone who saw the images posted on the web about Mary Beard knows that. Hilary Mantel's article appeals to the intellect; the rubbish aimed at Mary Beard did not. Mary Beard, being intellectual, shrugged it off as the rubbish it was. What Mantel has written is not rubbish, even if people disagree with it.