...taste by its nature, as I've stressed, depends on writing off certain things. You cannot say something is good without also suggesting a certain other thing is bad.
That is simply false. Taste is absolutely not a zero sum game.
The idea of an all-accepting universal palette is completely and fundamentally at odds with the process of making value judgements. You cannot do both. We might be able to like foods of all five tastes, but very few of us would like all foods.
Nobody - - NOBODY - - in this thread has suggested that the answer is to simply like or even accept everything.
What's being argued, and what it seems to me you have yet to address, is that it is absolutely possible to enjoy a wide variety of different things: Music, food pro wrestling, and so on.
To decide I like one type of pro wrestling in no way necessitates that I dislike other types of pro wrestling, even if those other types of pro wrestling are wildly different from the type I have decided I like. That's a frankly ridiculous idea.
And, to clarify: To like various types of pro wrestling in no way means that I therefore have to accept everything. That's also frankly ridiculous. There's good lucha and bad lucha, good southern style and bad southern style, good indy and bad indy, good shoot style and bad shoot style. Surely everyone understands this.
So, why not choose to seek out "good wrestling" whatever form it may take. Surely that's better than pre-determining what is good and then judging based on how well those pre-determinations are met.
Taste is defined by discernment, literally speaking "the ability to judge well".
I think that "applying a limited standard and judging based on how well that standard is adhered to" is absolutely not "judging well." Paula Kael had a wonderful essay where she took to task those critics who analyzed and judged every film - regardless of its intent and regardless of other virtues or failings - on how well it addressed issues of social justice. Those critics were relentlessly applying a limited standard. They were not judging well.
Things need to be judged on their own merits. A broad perspective is most helpful in trying to do so. Here is what is not helpful in doing so: Artificial guidelines of what should be considered good, with the idea that all else must be considered bad.
And so, in the end, I agree that there cannot be a universal standard... or at least, there should not be.