Yep, that's why I would only respond to questions, and/or would point out any fake facts if I see them presented.
There is no point to debate people from either camp if the topic involve subjectivity.
The funny thing is, of the 50% (not sure how accurate this number is, but I'll take your words
) would typically point to the importance of only what they hear, like, and prefer matters. Some would simply state that the "sound signature" thing is real, wonder why others couldn't hear/tell etc... They rarely, if at all, provide verifiable, and explainable (based on EE principles) facts to support their claims, other than insisting they all sound different, even night and day kind of difference, and even at low spl.
The other 50% would often point to controlled comparison listening tests, similarity of circuity design, that amps are matured technological products, threshold of audibility in measurable specs etc., while they can never deny, even though some may try, what the other 50% heard for the obvious reasons. Same things day after day, it can be tiring to read, but could still be interesting or at least entertaining. That's why it is still going, I guess.