Philistine (n.) a person who is lacking in or hostile or smugly indifferent to cultural values, intellectual pursuits, aesthetic refinement, etc., or is contentedly commonplace in ideas and tastes.
“Maybe I’m a philistine, but I don’t see the brilliance of this.”
– about Joseph Beuys’ performance in which he walked around an art gallery explaining art to a dead hare he carried from The Know-It-All by A.J. Jacobs.
Bonus fun definition: Philistines were a people of coastal Palestine who made war on the Israelites. German slang evolved the definition to be a contemptuous term for ‘townies’ and by extension an ‘uncultured person.’