Rude buyer towards sales person - seeing the other side

As a consumer/buyer you should want to pay the lowest price possible for any item. As a business owner/salesmen you are not out there for the fun of it, you are out there making your living. You want and need to make as much profit as possible to stay in business.

As long as the negotiations stay civil I don't see anything wrong with it. If you are uncomfortable and find that sort of thing unpleasant as a consumer, then I want you as one of my customers!