What is a word for someone who denies themselves the pleasures of variety and selects high quality from a narrow range of the good things in life?
For instance, someone who likes only Renaissance art, early music, Italian cuisine, Swedish Modern design, country village holidays...
And not other varieties of art, music, food, design, holiday...
But not from ignorance. Nor connoisseurship. Perhaps (I don't know) from a desire for simplification, and it is a distinguishing personality trait.
and found it colourless, might have been to a country village and preferred an urban adventure.
People like what they like and sometimes are fine with that.
It sounds like you might be in the company of a friend and you desperately want the friend to expand his or her boundaries and enjoy the rich experiences that you enjoy. And the friend is Just. Not. Into. It. I could speculate further, but I'm sure you get the idea.
There's no word for the person who is limiting themselves to a narrow range, but there is a word for the person who wants the other person to branch out: frustrated.