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> no two people with good taste will have strongly divergent views when evaluating the same thing

I disagree with this assertion (look at the heated arguments between different interpretations of quantum mechanics as a simple counter example that comes to mind). If I'm reading you right, you're claiming that taste is just appreciation for beauty, which is itself an undeniable objective truth. But I think this is too extreme in discounting any subjective role in the assessment of beauty. Any object that we deem beautiful just is. Whether or not we ascribe it as beautiful or not says as much about us as it does as the object. What does universal even mean here? Universal to humans? Can dolphins have an appreciation for beauty? If not, can it be said to be truly universal? If so, do we think that the dolphin's standard for beauty is identical to ours?

Again, I do agree with you that there are certain archetypes of beauty that most people will agree on. I also agree with your point that some people will dismiss beauty out of a sense of sour grapes. I just think you are taking things too far in the claim that beauty is a universal, objective truth outside of the realm of subjectivity. The concept of beauty itself cannot even exist outside of subjective experience so how could it completely transcend it?