The question was, would he accept independent reconstructions from other sources to change his opinions, since he finds PCA so objectionable. There are obviously lots of concrete arguments--I could come up with a pretty list of papers--but my time is valuable and I was curious if he was genuinely interested in the answer. (Apparently not.)

I don't even get what you're getting at: scientific arguments are also not decided by someone spouting off something they read off of Climate Audit and pretending to be an expert when they don't even have a passing familiarity with the scientific literature. Asking an open question "well, what would make you change your mind" is a perfectly reasonable response, especially when the answer is, expectedly, "nothing."

No, I'm not a climate scientist, though an immediate family member is.

Actually his answer was that he is familiar with several independent reconstructions and that they suffer from similarly problematic flaws, not that he is not "interested in the answer".

Your second paragraph is an ad hominem, where you make various assumptions about the OP. Yet there is still not a single coherent argument why the OP was actually wrong.