If Snart is going to treat him like the help, Mick is going to call him 'boss' rather than friend, 'boss' instead of partner.

He scowls at the demanded question. "You don't need me here. The job is planned and you're just using the down time to boss me the fuck around and pick at every little goddamn thing I do. You want someone to boss around, call Enderle, call Mardon. Call someone else."