I was thinking of exchanges like this, in which my interlocutor took it for granted that musical taste is analogous to color preferences (and therefore of no greater intellectual interest), and displayed no interest in updating his beliefs on this question (I assume because of an unverbalized feeling that the topic isn't prestigious enough to think this deeply about).

Generally, what seems to happen is an inescapable spiral of "my heuristics tell me this comment is low-status, so I'm not going to read it carefully enough to notice any argument it may contain that my heuristics are wrong".