Receptionist needs customer service training urgently

Because of the receptionist I will not be returning to Dr Groener. I was running 10 minutes late and I had the decency to phone them and let them know. When I arrived flushed because I was in a rush she reminded me that I'm late and that they allowed another client before me. I understood because of the situation. She then carries on saying that Dr Groener was saying why are coloured people always running late and that we're never on time, I was taken aback by that statement and didn't find it amusing in anyway, baring in mind that I have 2 toddlers at home under the age of 5 and a 5 month old baby and it's Saturday, so 10 minutes late isn't very late. This woman then blames me that she's going to go home late now because I came in late. She also insults me further by assuming that I know nothing about my medical aid but I just went ahead and signed. How is she supposed to know every medical aid by heart. 2 people, a man and a woman arrives at the door and she's furious talking to herself saying it's too late for people to come now and they definitely coming for extractions and they don't have time for that. She allows them in regardless and all this man wanted to do was make an appointment for later in the month. She gave him a tough time before he could actually explain himself. Because of this woman's sarcastic remarks, ****** comments and the poor customer service I will not return. I've had my fair share of Frontline service and customer care and what I've experienced at this practice was the total opposite of what I've been taught. This was just disgusting. She made the practice lose potential customers. Customer service 101, make sure you treat your customers well cause they're the reason you have job to get to.