beauty and ugliness sure as hell do have objective realities though. it's for that reason that leonard da vinci was able to calculate on paper the dimensions of the classically beautiful face. if math is objective then beauty is objective, because you can apply to it mathematical principals. of course there are always anomalies: beautiful people with asymmetrical faces, with eyes that are too close together, etc.
beauty is something that appeals to the imagination, but which shouldn't require the imagine in order to see. if you're using your imagination in order to find someone beautiful, fyi, that person aint beautiful.
I think punk is very intellectual because it's working in reaction to what came before it. found art is intellectual because it requires a certain attentiveness of regard for daily life, the imbuing of significance into mundanity, which is always a worthwhile artistic endeavour.
my problem with 12 year olds defining what is art is because 12 years old are notorious sell outs. they'll set out anything to be popular, to be liked, to be pretty, to be cool. they have no notion of the value of anything not advancing them in these directions. until such time as they achieve a sense of self worth not contingent upon what others think of them their opinions and, indeed, whole persons, should be eschewed entirely. of course, as with beauty, there are always anomalies (myself at 12 years old, for instance).