Back in the 80s as a freshman in college I heard my first CD player. The technology seemed pretty cool but I was afraid to be on the only one in the crowd saying "vinyl sounds better". So I suppose it was a moment when I realized worse sound was possible yet promoted as better sound - actually only "more convenient" sound.
Good one. Good for you. I'm older, CD came out after college when I was broke and moving around and keeping my treasured turntable safely stored away. So I never did compare and with all the moving around didn't notice and just assumed everyone was right and CD really was better.
Until years later building my listening room which of course started with CD and was surprised to read Robert Harley's book saying "the turntable is the foundation of a high end music system."
Say what? So I dug my Technics out of storage, hooked it up, and sure enough that beat up old table trounced my much more expensive CD player.
This was by the way after the earlier episode of learning to listen. Better sound was not only possible- I heard it!