Rude Manager Phumzile at Wonder boom junction KFC

A lady by the name Phumzile who looked the manager cause she was wearing grey uniform whilst the rest were wearing red. She told me to shut up when I spoke to her about undermining people. I didn't even put race into it. But it was clear that it was racial. We were buying and clearly there 1st. The other ladies who just happen to be white we behind us. The cashier lady obviously saw it and attended to us 1st and she was repremade for not asking who was 1st. Everyone saw we had been there 1st. When I called her out she said I should shut up as she is not talking to me. I told her am talking to her as a customer that in future she shouldn't undermine customers. Does she think i would jump the que at KFC when it was even empty.