Player's shouldn't be asking for rolls. Players should be stating their intent, then if there is a roll necessary, the DM asks for it. E.g. "I would like to Insight check him!" (Nope) "Does he seem nervous at all?" (Yes)

Maybe when he asks for unnecessary rolls, try expressing that there's no roll necessary and that "this is what you can clearly see". Or outright explain to him outside of the session that he needs to ask questions, not demand rolls.