I had not read Jim the Realtor’s blog before. But now, I have.
I agree that Jim’s blog is his “place of business” and sort of like his “why I’m qualified to serve you” brochure. Therefore it wasn’t appropriate for powayseller to blatantly contradict or refute his message there.
On Piggington, it’s totally appropriate for powayseller to express her opinion, however unpalatable to some.