Talking on your cellphone whilst trying to check out. - This is just fucking rude. I'm sitting here trying to do my job, and tell you how much your transaction is going to be, asking if you want credit or debit, and you just hold up your finger signaling to me that you would like to finish your phone conversation first. Fuck that. Also the people behind you don't appreciate it either. I promise.
Cutting them off while they are trying to tell you about a promotion or are asking you to sign up for a rewards card. - Listen, do you think I want to ask EVERY SINGLE customer I get to sign up for this bullshit card? No. I don't care about the card. I couldn't give a rat’s ass if you sign up for it; just let me finish my fucking sentence. It's just common decency.
Trying to blame a company policy on the cashier/anyotherhourly. - We most likely agree with you that the prices of the shit we sell are too high. We can't do anything about it. I also think that the week-long return policy is ridiculous, but I still can't take your broken shit back. Stop yelling at me.