Cheesemonkey

Derogatory; affectionate. A person who enjoys tacky, cheesy, kitschy, saccharine or niche art and/or humour and is considered, by the speaker, to be naive. Unhip. Geeky.

Jack: "Have you heard The Bad Plus' version of Everybody Wants to Rule the World?"
Jill: "You are such a cheesemonkey."