It's like, what do you call someone who would rather read the starship specs on Wookiepedia than read a book on medieval warfare?

An escapist, I suppose. I read an account from a POW kept for years in solitary confinement who said he kept himself sane by creating an entire fictional baseball league in his head and tracking the players stats and imagining their games. Prisoners retreat into worlds of imagination because those are the only ones where their interaction has any sort of meaning or relevance. Someone who spends their days in drudgery chipping away at the walls that hinder more powerful peoples dreams may want to spend their off time inhabiting and learning about a world that seems no less far fetched to them than being able to tell their boss to go fuck themselves and a good deal less soaked in vitriol.

To a slave being unproductive is rebellion, maybe the only kind of rebellion they consider realistic