So then who is the arbiter of good taste? Whose subjective opinion matters? I’d say you’re only in a position to assess the quality of judgement (a) after having lots of experience, (b) that experience can’t be the same thing repeated over and over - it has to be experience ranging from doing it wrong to doing it right, and critically, learning from those experiences.
So good taste means approval from those who have struggled and learned from that struggle.