RaceTrac review: customer service/ cashier

Walked up to check out and get gas this morning. Cashier had walked away from the register as I was approaching. Was being overly dramatic grunting because there was a customer walking up to pay for merchandise and prepay for gas.
As of there was anything else I needed. I replied that I needed the rest out of $35 on pump number five. Looks at me gives me attitude "oh I guess you need me to do the math?!?"
My reply was "if you are going to have an attitude with me, I will just leave".
Needless to say I didn't get what I had requested and left getting less than $25 in gas.

Rudest customer service I have ever had!