Just don't annoy him

My mate went to get some stuff and whilst he was there a guy came in after a headlight.

Owner went out and climbed over loads of cars and got the light off finally and came back to the buyer, showed it to the buyer who looked it over and said its just what he wanted and how much. Owner told him price and the buyer responded, i'm not paying that its not worth it etc and proper kicked off saying the guy was ripping him off. Owner turned around and chucked the light on the floor, told the guy to f* off and get out of there.