I consider myself an objectivist, and someone who just like the Idea of transparency and don't go for the hype and nonsense when it comes to audio. But the claim you make, suggesting anything else is plain ignorance is very debatable.
1. The Human ears range is less tan 20k, that's absolutely and objectively correct, but the thing is, everything above that still reach our eardrum, but don't get trough, but those harmonics have an influence on the waveshape that we do hear, they just get filtered out, everyones ears have a different, unique response. but there is absolutly no evidence that the way it's filtered by our audition system is the exact same way the filter at the input of a DAC does it. Keeping the inaudible frequencies of a signal insure that its your ears that will do that job. Play a square wave at 15k, there is a difference between what I, what you, and what a measurment microphone picks. 2. the word lenght, or if you prefer difference between 16 and 24 bits. is directly linked to Signal to noise ratio and I can assure you that a trained ear can ear the difference. Maybe not in pop music, but capture an uncompressed performance and with 24 bits you are a magnitude further than the added noise floor of your equipment. It will be heard sometime, and sometimes not, but it's in any case not subjective, if background noise is being heard, it's real. 3. I just like the sound of vinyl, yes it's subjective, it's just something I like. Claiming it's better is not the point, but claiming it's a preference, there is nothing wrong about that, cause OBJECTIVELY, it sounds different.