Assuming this person's friend is like the friend I have of the same stripe, it's probably not that the person won't watch. It's probably more than if they see the movies in your house, or if you mention that you're going to watch one, or have one on if they come over to visit, then they feel the need to tell you, repeatedly and at length, how terrible the movies are. It really saps the enjoyment out of a thing when you have to hide your DVDs before you invite a person over.