I can easily hear the differences between tubes, transistors, digital amps (class D) etc. I can tell quality with my ears as well.
Even so, I'm betting you'd have your mind blown by participating in a double-blind listening session where you put this assertion to the test.
But then again we are talking about different technologies here too. Tubes vs. SS, Class A vs Class D.
At least there is a potential understanding why one might hear a difference between an apple and an orange falling in the forest with no one around.