I don't know what makes customers think that just because you are a sales person that you deserve less respect than other higher beings.
Preach it, brother! I agree. That's what is nice about having the right to reserve service.
When I first started, I would bend over backwards for customers and every once in a while some jackass would kick me in the butt. I would just smile and take my lumps because I desperately wanted to prove myself by making every sale. One day, I was moaning and groaning to my boss about some customer really beating me up. He said "Tell them to take their business somewhere else. If they're going to act like a jerk now, just think what a pain they'll be down the road. We don't necessarily want everyone who walks through the door as a customer."
I replied "I thought you'd be ticked off if I ran them off."
Boss: "Heck no! Send them packing."
Life's been good ever since. Sales have gone up and business is flourishing. Treat people like you want to be treated, even salespeople (except for goat-smellin' Amway type goomers).
Terminator