Michael,
Finally, let me admit where I was wrong, or at least infelicitous. I said you can't "argue over art." What I should have said is that one cannot present an argument that produces certainty. I was using the word "argue" in the above quote in the sense of "concluding an argument" with a fair amount of "agreed upon certainty." I thought this was obvious enough when I was writing quickly because explication, praise, reactions, revelations, and descriptions of experience can all be part of arguments over works of art. Rational argument is, and must be a part of our judgment over art. An argument over art is continuous and inconclusive by nature. That is why tolerance of differences in taste in these areas is a necessary condition for rational argument. In short there can be argument but no certainty.
Which brings me, Michael, to another ambiguity in all of your arguments so far. I think you confuse "objectivity" with "certainty" and "objective reality" with "certitude".
Objective reality is just everything including the special case of the subjective. Even my qualitative. personal, and intrinsic taste of dandelions in vinegar (I love it) or "Star Wars" (I hate it) is part of objective reality. I am fairly certain that my experiential taste is "real." But I am not certain that my judgment can be said to be correct.
Art is part of objective reality. But certainty about our judgments are mostly self-delusions. We can be certain that 8 + 16 = 24 (base 10). We can be fairly certain that the earth turns on its axis and follows an elliptical orbit around the sun as long as all of our definitions are correct. The certainties in these areas are special, either from definitional principals or from agreed upon theoretical observations. There is simply very little that is like these kinds of certainties when we come to studying human experiences.
This does not mean that our conclusions are not objective, or event that most of us can't come to agreement about certain things in art.... It is just means that our conclusions are not certain and are open to a range of disagreement.
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