It’s definitely a Jealousy thing, every sports car I have owned from Camaros, Audi’s, GTI’s, Sciroccos, Megane Rs’s and now 350z, have all had negative comments or backhanded compliments where people want to give you their two penneth on your car. Like the fronts ok but I hate the back, or there not that fast. (yeah 0-60mph in under 6 seconds is well slow??? ) But I couldn’t give a flying Fu*k, as all that counts is I like it, and it puts a smile on my face when I jump in a go for a drive. And as said before they normally drive some daily driver piece of crap.
I would probably question why he hasn’t got anything better to do with his time than watch you wash your car?? Surely it’s sadder to watch a man wash his car, than make your zed shine like it should??