@snilf
As somewhat of a philosophy fan myself...
I think your initial post started with a bit of conceptual muddying. Right here:
Do you fall on the side of the inviolability of subjective preference, or do you insist on objective facts in making your audio choices?
The muddiness starts with your referring to subjective "preference" rather than "impression."
The tension between the "subjective" and "objective" in audio, that is the tension that tends to make it look like some people are divided in to different camps - e.g. "subjectivist/objectivist," comes from an epistemic divide.
This epistemic divide is over the question "How do we evaluate the performance of audio gear?"
To generalize, the objectivist takes a more engineering/scientific stance to this type of knowledge. This combines an appeal to measurable characteristics (important insofar as they have been fairly reliably correlated to SUBJECTIVE impressions), with a central acknowledgement of the problem that humans are quite fallible and prone to bias effects. (Hence, listening tests controlling for bias effects become relevant).
So when it comes to our perception, "A seems to sound different/better than B," the objectivist will consider that with respect to the plausibility against what is known in technical terms, and look for technically plausible explanations, and he will hold subjective impressions, his own included, as suspect to the degree that such claims are more technically implausible. (And hence blind testing becomes ever more relevant).
In contrast:
The subjectivist holds his Subjective Impressions as "inviolable." He trusts his senses, his perception, to deliver accurate, reliable results, as the final arbiter of the "truth of the matter." "If I routinely hear a difference between A and B, then there IS a sonic difference between A and B" and if objective evidence doesn’t support this, well so much the worse for that "evidence." It must be wrong because my perception is right.
It’s pretty obvious why this epistemic divide would produce clashes. (Very much like atheists debating against faith-based beliefs).
But the key point here is that it would be clearer and more to the point is that referring fo "subjective preference" doesn’t get at this issue. Because "preference" tends to presume there IS a difference to "prefer." Virtually no "objectivist oriented audiophile" I know object to anyone having different preferences. They are more concerned about claims to KNOWLEDGE based on subjective IMPRESSIONS.
So if a subjectivist says "I preferred AC cable A over AC cable B in my system" the objectivist has no problem with preference, only with an objective claim hidden within, which is that cable A actually DOES sound different from B.
All too often these conversations get confused when subjectivists appeal to "preference" in which they are clearly begging the question that the objectivist actually cares about.
Therefore, your original question would have been more on point to ask something like:
Do you fall on the side of the inviolability of subjective IMPRESSIONS, or do you insist on objective facts in making your audio choices?
(I would hope it’s not necessary to add this caveat, but just in case: The discussion of people being "objectivist" or "subjectivist" is a generalization to clarify the points that tend to come in to tension. That doesn’t mean that there isn’t a broad range of attitudes among audiophiles, who can be anywhere on a spectrum between the two epistemic positions. Even a single audiophile may be more "subjectivist" about some of his purchases, more "objectivist" about others...or his attitude may change on a whim from one time to the next).