Tired of rude people

It amazes me how many people think it necessary to be rude to sales people. I am so tired of people coming into my store either in a bad mood or with an attitude. I really dont mind helping people locate what theyre looking for, but please dont have an attitude. Im just a normal person trying to earn a living like everybody else. I dont like being treated like gum on the bottom of your shoe. I realize that there are some sales people who are not very customer service oriented. Ive run into them myself. Unfortunately they ruin it for the rest of us. But please keep in mind we're not all like that. I work retail because Im a people person. I enjoy it. But all it takes is one sour grape to ruin my whole day.