A key part of how to see if someone is just parotting acceptable opinions vrs is actually having an opinion, is to make them explain it. If its a generic "oh you need to read it, its great" or parotting of popular talking points, that person is not serious about their taste. They use the art as an ornament to make their personalities more interesting than actually engaging with the art in any meaningful way.
The only reaction that matters should be your personal one and what resonates with you.