Whether or not objectivity exists in art is for all practical purposes a moot point. It makes me uncomfortable to admit that things exist beyond the quantifiable, but as soon as an authority posits an ‘objective’ judgement in an artistic discussion, the discussion is dead.
It can be compared to a discussion of free will. You could state that free will doesn’t exist because it’s all just deterministic quarks and charm, but even if that’s true you must put aside the objective fact and act as if the abstract awareness arising from this base matter is more than the sum of its parts.
Art has objective components, like the brain. But like the products of the brain, it also must ultimately be viewed as something which transcends its constituent parts to become more, unconstrained by judgments of the ugly bits of which it is comprised.