I've only had this happen once. I haven't read face to face for a large amount of total strangers, less than 100 probably. Once I was at a relative's house who wanted a reading and she had gathered quite a few people there for me to read. One by one they came into the room and things were going fine. Then, a man came in who I had not met before. I asked if he had any questions and he said he didn't, so I just laid out the cards for a general reading. What came up and what I said seemed very clear to me, but he would say, "No, No none of this is making any sense for me, I don't think this applies, etc etc." He had never had a reading before, so I was more concerned that I had made a bad impression of Tarot readers in general and he would go on thinking we were all bad due to this one experience. Anyway, I told him I'm sorry that the reading didn't resonate and there was no need for him to pay me. Later after he left, one of my relatives (who was his girlfriend) came to me and said I was absolutely accurate with everything I said to him. He didn't know how to respond or how to face the situation and so he just said everything was off. He was uncomfortable getting a reading and uncomfortable with the situation being addressed.
So, I guess what I learned from that is, all we can do is read what we see. we can't be responsible for how the sitter takes the information or reacts to it. We've delivered the message the best we can, the rest is up to them. Of course we can always be wrong, but sometimes, as mentioned above, we don't really know that until much later. So, I'm sorry you had an experience like this, but as others said, don't take it personally. Use it as a teachable moment and just move on. xoxox