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What is the name of the logical fallacy where you rhetorically invalidate an argument by providing an unflattering explanation of why someone might holds that viewpoint, rather than addressing the claim itself? I seem to remember there being a word for that sort of thing.
It's "explaining away" or "intercausal reasoning" applied to the "good reasons → belief ← bad reasons" Bayes net, and it's not really a fallacy. It doesn't invalidate arguments directly but it should still make us decrease our belief, because (1) we need to partly undo our update in favor of the belief caused by observing that the other person holds that belief, and (2) we need to compensate for our own increased desire to believe.
It's often rude, because it implies that the other person is either dishonest or stupid, since it... (read more)