The best definition of taste I found comes from painter John Folley. He says “‘Good taste' is simply to have a well formed opinion, in accordance with the realities of the Good and the True.” There are tasteful and non-tasteful choices. Taste reveals its purveyor to be a good decision-maker.
"It’s up to us whether or not we care about the shades of distinction between human and machine choice, or indeed if we care about fashion at all. Maybe taste is the last thing separating us from the Singularity"