It's funny because it's always the extremes:

Either they ask if I'm a "professional", or else they imply that I'm too dense to have realized that it's the digital age now.

Most have a good sense of humor. I was lugging my 8x10 on tripod up to a lake near Mt Rainier and a lady said: "you don't have to go up there, I already photographed it with my cell phone".