Dude, so let me get this straight....you drive that douche bag around and you go to get him beer buy a 6 pack for yourself and then when he finds out you buy him a six pack back now he wants more? Fug that guy! I learned a long time ago that people don't take advantage of you if you don't let them......I'd say its my car, f off....I'll give you a ride if I'm going that way otherwise get to fuggin walking.
Its not your problem these douchbags don't have a car, a mealplan, or any fuggin manners.