Bad Attitude from a Pep cashier

Yesterday i was waiting in a queue a gentleman in front of me was paying for a smart tab. He was asked for his phone number and he didn't know it off head, he took out his cellphone to check it and the teller said to another \I really find it annoying to help people like this one. What type of person does not even know his number. I am really getting annoyed"she continued talking about the man in front of him in a language that the man understands. when it was my turn to pay i said to her \""the way you spoke to that man is not very nice"