The argument is invalid. That aside, I don't accept either premise (especially 2) or the conclusion.P1. If a thing is objectively good/bad/worst/best, it is good/bad/worst/best independent of opinion.
P2. The standards by which aesthetics are judged, are, necessarily, opinions.
C. It is not possible for a thing to be objectively aesthetically good/bad/worst/best.
Which of these do you dispute?