Am I being rude?

Don't get me wrong, I have no problems when people see me working and walk up and want to ask about the car. Like at some of the shows, I tell people to ask any questions, as I love talking about my car.
But my problem is the people that pull up, roll down their windows and ask, What do you want for the car. or questions that I can barely hear, then expect me to walk up to them.
Like I said, if someone asks how much for the car, I say $50K. If they ask if I was kidding, I would pause, think about it and tell them they are correct, I should have said The car is worth $75K.

Get the hell out of your car and walk up and talk to me like a civilized human. I love it when you tell the gypsies that the car is $75K and they want to haggle. They start at $3,500
Then I ask if they would like to see my guns, up close and personal