Bad attitude

Cashier not friendly at all. Does not communicate with customers. We had to notice that our change was short until she extended her hand without saying anything-giving us the change. We then greeted her and she didn't respond. I even went to the lengths of asking if she is ok..she still mumbled her answer. To my surprise, the was another customer behind us..she greeted the person and even aske how she is. This kind of attitude is disgusting and not appropriate at all. If this is the kind of attitude one receives from cashiers, then why shop where you are not apprecited?