I grew up believing that taste is just a matter of personal preference. Each person has things they like, but no one's preferences are any better than anyone else's. There is no such thing as good taste.
Like a lot of things I grew up believing, this turns out to be false, and I'm going to try to explain why.
One problem with saying there's no such thing as good taste is that it also means there's no such thing as good art. If there were good art, then people who liked it would have better taste than people who didn't. So if you discard taste, you also have to discard the idea of art being good, and artists being good at making it.
This shift in the criteria of greatness is so profound that it is necessary to divide the discussion of the psychology of great art into two sections. The first is devoted to art created prior to the advent of Modern art, and the second is devoted to art in the Modern and Post-Modern era.