I don't think they mean to be rude I think the car is so iconic that in the back of their mind they are wondering "Can I Get One"? I always tell them:
You can get one that runs for 5-10,000 but it needs a lot of work
15-25 will get you a nice car but still needs some work
35-45 will get you a Really Nice car
and if you want to get a remanufactured one 60,000 or so.
After that they usually either ask more reasonable questions or walk away. I have run into some real assholes but 90% are ok