no matter the industry, assholes are assholes. some jobs there is a higher % that are jerks, but no real rule, and no matter what the likelihood of running into an idiot, you should never just assume the worst... that is a sure fire way for a self fulfilling prophesy...
anywho... if i tell anyone who drove a trade in (lady, old man, monkey in a hat, etc.) it's more to show i know the car better than the guy at the "value" lot with 700 cars will know his... the more you know and all that. not that they should assume anything about the previous driver... i can't very well ask someone not to pre-judge me, yet to stereotype the previous owner.