She is not the only one who has never tried; he is not someone people Reason With. Attempt to mollify, yes. Capitulate to, certainly. But not Reason With.

"I cannot value that which has no worth." he retorts; there is more than a note of defensiveness in his tone, a deep discomfort with how quick she is to dispute those things he considers immutable facts (as he has said, he does hate to disappoint her)."If they would be considered, let them first show us that which merits consideration."