After passing your practical test perfectly, you accidentally overlooked the right-of-way rule in an empty parking lot?

I had my practical test today and I was nervous but I drove very well, almost perfectly, my driving instructor even said so, but 5 minutes before the end of the test we drove into a parking lot where the speed limit was 10 km/h and you could see the whole parking lot, it was empty except for one car but that was parked at the other end. We pulled into the car park. As we were turning, I could already see the parking space and saw that it was empty, but as we drove on, the examiner said that I had overlooked the right-of-way rule and that it wasn't allowed. We drove on and I had to turn around. Everything went well and at the entrance there was right-of-way again, but I paid attention to that. After that, however, I had to stop and the examiner told me that it was over and I had failed. He then went on to say that it was no use observing the other right-of-way rule, which is what I had done after the mistake. I got emotional because it was all over straight away because of one mistake and I had to swap places with my driving instructor. When I was in the passenger seat, he said to me: "Now stop crying." That is burned into my head and I find it very disrespectful. When we got to the MOT, he didn't even say goodbye to me. At the end of the MOT, the driving instructor comforted me until I was picked up. I don't think that's fair…