We all get them, it would be nice if they just said a simple "nice car, but not really for us". It seems they have to find a reason to criticise the car to justify walking away.
I had a random one the other day, he walks in the office and states
'Your CR-V is a bit expensive, bit over priced' (its up for £11450)
Me "I don't think so, given all the spec its got on it, SAT NAV, LEather etc"
Him " I use a Map, prefer cloth and hate sunroofs"
Me "Well it's not the car for you. So are you looking for a CR-V then?"
Him "Yes, want to spend £10k on a basic model, same age and mileage as that"
Me "So mine isn't over priced considering SAT NAV and Leather etc give about a £2k premium over a base model"
Him - Blank look and a few muttered words.
I think some people see us as the enemy and they have to prove us wrong at any given time. Don't ask me why, either that or a fair few people don't have the social skills to comunicate what they really want to say.