Is it OK to dumb yourself down in order to enjoy being with a certain friend?

I’ve known my best friend for six years. He’s an extremely nice person, and fun to be around. The biggest thing that we have in common is sports. But honestly, he’s not the brightest person. He always gets impatient with me when I talk to him about politics, art, books, and anything news related. He even hates talking about the meaning behind a movie or a song. (Hard to believe, but when I saw Inception with him and other friends, he had nothing to say about the movie). So I constantly have to dumb myself down around him. Am I being fake for doing this?