"people have the taste of Philistines"

The Philistines were a people who lived on the southern coast of Canaan during the period of the Iron Age, about 1175 BCE. According to the Bible, they were the worst enemies of the people of Israel: Samson famously fights them in the Book of Judges.

Though not normally capitalized, the word has in recent years come to be applied to anyone who lacks cultural graces, intellectual drive, or aesthetic refinement -- persons with dull and commonplace ideas and taste.