I didn't know that 'White Supremacy' is still exercised in our 'Free' country

I visited Checkers supermarket at Knysna Square on saturday 19-08-2017 around noon to get lunch. It was a bit busy and on every till was a longer queue except the kiosk. So I did what I usually do in such peak times and I went straight to the kiosk to pay for my lunch. Unfortunately this time the cashier in that area addressed me in a condescending tone saying ''I cant help with that. We only assist do sales on items found at our kiosk here. For anything else from the shop you need to go queue at the shop tills.'' That came as a shock to me, given the fact that I usually shop there and always assisted at the kiosk, so i confirmed this with a manager on duty (Sylvia Silimela) and she said the cashier statement was indeed true, so I ended up queueing at the tills. After having to have stood there for 10 minutes at the back of the queue, I saw an English-speaking client approaching the kiosk with items from the supermarket being assisted by the same cashier who profusely refused to assist me, I went straight to the kiosk and asked how is it that she is scanning items from the supermarket after what she told me? She ignored me, then I fetched their controller to come intervene and she brought Sylvia Silimela, who now came with a complete different statement that ''we do assist people with items from the supermarket at the kiosk, they just need to purchase at least an item from the kiosk with'' and my question was why was that information not shared with me initially? Did it have to take me 10min wait in a queue and pull some displeased client drama for that to be shared? No consideration was given that I even left there without my lunch. I work in the knysna sqaure center and I believe that supermarket's client base is made up of people from different races and all walks of life but white-supremacy still rules. I've been watching it over the 3 years tht im working in the Knysna area.