I don't know what "exception bias" is* (nor how to weaponize it), but I assure you that Expectation Bias, (also known as Experimenter's Bias) is for real, and it is quite similar (even identical) to rejecting contradictory information.
Well played. You exploited my auto-corrected error. I'm going to leave it, in the interest of good sportsmanship.
I see that you chose to ignore my embrace of expectation bias and switch to mocking while attempting to drive home your idea, as though you were correcting me. Your post is a display of hubris. While I respect your position, I'm not in need of an alpha leader so I don't chose to follow your mentorship.
I embrace the idea of expectation bias but I dismiss the idea that I cannot use an A/B switch to directly compare two devices with reasonable objectivity. While imperfect, particularly for extreme close cases, it is among the best tools I have available.
Consider how ignorant your position is. If I set up a pair of DACs connected to a computer on one side and an A/B switch on the other, then A/B compare the DACs using a variety of source material, you are explaining to me the comparison is not valid.
I'm going to go ahead and use the DAC I prefer, along with any other equipment I deem to be more enjoyable. You are simply fabricating an argument to dismiss the opinions of others and support your own.