Bad Service

The cashier lady with dyed hair gave me very bad attitude and poor service. I was waiting in line to be served next while she was serving her current customer, firstly, she took her time with that customer while he was buying airtime (+- 20min). The queue was piling up but this is not why I'm complaint of bad service and attitude. When it was my turn to be assisted, I had bought water and lays crisps only and then asked her to check my three lotto tickets now this is when she gave me an attitude and rep**** that I will HAVE to wait while she services other customers and then only she will come back to me because checking lotto takes time. I asked her why since she helped the previous customer for a long period without disruption but now she wants me to wait and lastly, when I told her that she's giving a customer bad service...she rep**** that she will no longer assist me in future because I said she's giving me bad service. I don't want to bring up racial issues but since I am black and she's also black, I feel that's the reason why she responded like such. If I was a different skin color to her, she would have respected my request and obliged.