How can you account for what is scientifically quantified as green but not know how people perceive it? Sure one can say objective green is really red, but there is a fundamental understanding of green through physics that says it is a definite wavelength. Regardless of your idiosyncratic green it does not change what is objectively green at a definitive wavelength.
Often we classify what we do not immediately know as esoteric and ambiguous. But really if we just motivated ourselves to understand the literature a little more we would not make conclusions that things are unknowable and subjective.
Goodluck,
Borealis
Be slow to fall into friendship; but when thou art in, continue firm and constant.