I have to say that it does annoy me to have to deal with stereotypes about the type of work that I do.
And even the old car sales stereotype -- You know what? They also provide a service. Granted, the nature of their business forces them to push or starve or be scooped by the next more assertive sales person, BUT if you want to know how many miles are on a vehicle, whether or not it has been in an accident, who the last owner was, want gas in it for a test drive, want it sprayed so you can see the paint for chips, want someone to negotiate repairs with the shop for you...
You think it's worth doing all of that yourself? Then spare a sales person and stay off the lot.
*End rant.*