Dollar General complaint: Rude conversation / behavior to a senior citizen.

I went to the register to pay for my items. Then the card reader / machine had a delayed glitch. So I told the employee I would pay cash, and he said it would reboot and it would be fine. So I waited, then I said again I would pay for my items with cash. Then the employee said, what was the need of you waiting if you were going to pay with cash anyway. Then I said because I wanted to make sure my card was cleared of all charges. Then the employee said that I was holding up the line, and I should of paid with my card in the beginning. Also it seemed as though he preferred for me to pay
with my card instead of using my cash, which either means of payment, should be my choice not his, ( not the employee). I am a 65 year old female, and I have never been spoken to so rudely before in my life, at any store I have shopped. I will NEVER shop at that store again.