unless you can FD too I wouldn't suggest being rude even if they are being rude.  You could have just replied something like "sorry" or just left.  but your response angered him just as you intended it to so his retort was with mobs instead of words. 
 
not justifying his actions in any way, sounds like a total dickhead, but you could have avoided it. 
		
		
		
		
		
			
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