Tell me about an artist or art style that you don't like. Now don't take this personally, as if the artist is making work that specifically exists to make you upset. Just think about things that you don't like, a good reason why that is valid, and make sure to not talk about money. It is easy to get wrapped up in how much a painting auctions for. For the most part the artist had nothing to do with that and it shouldn't influence you when talking about the validity of art.