"no sympathy gentles the stark observation of every detail, nor is desire roused; instead, this painting stimulates revulsion." "the lividity of death about her lower quarters"
It seems that he views women's bodies as purely sexual, they should evoke desire and lust, or, if they fail in that respect, then sympathy. A realistic painting of a older woman repulses him because it doesn't fit in with his view of how women should be portrayed. The language he uses is derogatory and vile. It's just a painting of an older woman, I do wonder how if he views his own body with the same revulsion....
One of the comments in the Standard says that 'his review says more about him than the painting' and I think that's spot on.