Gombrich on taste (via Herr Golaski):

The old proverb that you cannot argue about matters of taste may well be true, but that should not conceal the fact that taste can be developed. This is again a matter of common experience which everyone can test in a modest field. To people who are not used to drinking tea one blend may taste exactly like another. But if they have the leisure, will and opportunity to search out such refinements as there may be, they may develop into true connoisseurs who can distinguish exactly what type and mixture they prefer, and their greater knowledge is bound to add to their enjoyment of the choicest blends.

Admittedly, taste in art is something infinitely more complex than taste in food and drink. It is not only a matter of discovering various subtle flavors; it is something more serious and more important.