First of all, to be fair I know that dealerships have it tough because they get so many people who just want to try out the latest and greatest car with no interest in buying.
Having said that, I absolutely cannot stand attitude from sales people. Whether it be a higher end car dealership or high end restaurant, service people need to understand that their product may be high-end, but not them. They work there to provide service. Going by their attitude, you would think they owned the place.
My past cars, which were higher end models, were purchased from sales people who helped me eventhough showed up with jeans and a t-shirt. Obviously I still had to bargain on price but it was so much more satisfying knowing I gave my business to a rep who thought it worthwhile to serve me.
My super-small way of making the world a better place.