I got brushed off when I was looking for a 1DMk3 once at a local shop (Henry's for those in Canada). I had called ahead and asked it to be set aside, guy gave me his name and everything but when I showed up he had no interest at all. I'm a young guy, 26 years old and dress casual (ball cap, jeans, skate shoes) and he totally blew me off... wouldn't take the camera out of the box to let me see it and test it. Eventually I walked over to a guy in a different shirt that looked like a manager, told him I wanted the camera, paid cash and when asked who helped me I just said "nobody".
Another time at a different location I had bought a 100-400, took it out to shoot with it and it was quite soft so I returned it the next day. The lady hooked it up to one of their display cameras, fired a picture and looked at the LCD... no zoom, pixel peep or anything and said "Must be your camera, this looks fine to me".