The story is quite simple really.
There are two friends. One is Robin, the one whose pictures are posted here. The other isn't Robin and is not built like the pictures. He was under the impression that he was going to be seeing Robin, and I'm assuming that the person he was texting didn't imply/indicate otherwise. He saw Chrissy and wasn't happy with what he saw. Put $20 towards the inconvenience and left.
I feel that he handled the situation very nicely. The $20 was a good touch. I went over there once and they did something very similar to that to me. I saw Chrissy at the door and Robin was sitting inside. She told me that she was available but not on the day that I visited. I saw Chrissy. I was happy with her... but YMMV. Keep in mind also that they are not built alike at all.