Dialog starts with questions, not lectures and calling people idiots.
Maybe, "Hey, can I speak with you?" might have been a better way to get his attention than, "You know you have it backwards." Introduce yourself, ask his name, tell him yours, ask why he has the red light on front and let the conversation proceed from there.
Conversation is an art which has been lost in the internet age. Now we shout, lecture, trade series of competing "I" statements and then complain to the internet that everyone around us are idiots.
-Tim-