Pretty sure it's just the words "Pro-Touring"... The builds everyone reads about sound like a millionare threw 100k at an already expensive car. So that's what everyone seems to assume...
There's your answer. Next time tell them you're working on a POS Duster and see if their attitude is different. I never brag on my car especially when I'm trying to buy something from someone.
A wise man once told me always make people think you're a poor broke bastard and they won't expect you to buy lunch!!