I don't want to lie. On the other hand, his critique is spot on, and I don't have rational arguments to support my stance.
Anyone who isn't a total snob has had the experience of liking a band/show/movie/food/etc that isn't considered 'sophisticated'. For example, I realize that corn dogs are not fine dining, but there is a reason why corn dogs are popular and sometimes they really hit the spot. I can simultaneously enjoy corn dogs for what they are, and agree with all of the reasons why a gourmet chef would never serve them at their restaurant.
Assuming your friend is not a snob, you can just say something like "Yeah, I totally agree with what you're saying! But I have to admit, I really enjoy something about their music." Your friend will most likely respond with understanding, and if they don't, that is a different problem.
