kuda | People can be so rude

Woman wants to do a return. Refunded an item with a receipt. No problem. Then she starts digging in her handbag looking for a different receipt to do another return. Can't seem to find it. Says that the person who helped at a different store must not have given her her receipt back. Then she asks me if I gave her back the receipt from the return I just did. I point to it laying in front of her. She moves to the side and digs in her handbag again. She finds the one she was looking for and I do that return. She goes off into the store.

A few minutes later she is back. I'm with a different person doing a return. My coworker tries to help her. She hands her a bag with clothes in it. My coworker asks if she has a receipt for this item. Woman starts saying it's in with the clothes. No receipt in the bag. She starts yelling at my coworker. Turns out it was in a different bag. Then she starts cursing about kids in the fitting room making too much noise. Says kids shouldn't be allowed in the fitting room. She must have said "f*ck" a dozen times in less than five minutes. We just ignored her and gave her her return. Why? Why do people feel they act act like that?