Belief is the important word that's used there. I am speaking of "rational", deliberate, analytical component in observation. Practicing observing aural or visual differences, like anything else, from plumbing to cooking, requires a set of techniques, vocabulary, and accumulated observations. The better practiced a person is at noticing things that happen in the sound and vision experience, the better the judgements about what the differences are and what makes them so.
Belief is different from preferences. Audio and visual awareness and critical thinking are acquired things.
Getting better at those things is not a bad thing. Knowing the difference between things is a developed ability, provided the acuity it there of course. Anything I have ever done, from furniture making to engineering music to gardening, has gotten better by practice. Who's against practice or getting better at something? (!)
Don't take this personally. This is just so. Cables that cost more than the $3 or $12 cable, and at a wild amount more than that, e.g. Audioquest Vodka or even Cinamon HDMI, are not make believe prices. They charge so much because they are that much better. Unfortunately, it is not so easy to make a high end cable, so many many hours and much experience is required. Blue Jeans or other higher price cables do not
have the expertise of the upper end of cable makers like Audioquest, Synergistic Research, Wireworld and others.