Sometimes!
They don't mind exhibits with classical stuff, like the old famous religious paintings, or the other "old masters", but they really don't get modern art or interpretive stuff. Lisa will take them to one of those 'colour swatch' style canvases and ask what they think, and they just stare blankly for several minutes.
(John does quite like surrealism though. He doesn't 'get' it, but he thinks it looks cool.)