Maybe we had to hear his tone of voice to understand why you're hurt at his words? Because, on the face of it, I see what he said as factual (mostly) - it HAD been covered in white out, it had been given to a new person (BUT he could easily figure out what time it was, even if truly covered in white out, appointment books aren't mysteries to figure out, for Pete's sake). Things change and you lost your appointment slot, but got another one, so not truly a huge deal, right? It resolved itself eventually? You did the right thing to cancel early, thinking you wouldn't be able to make the time slot, and as a result lost it and couldn't get it back. He DID overshare though, he should have left it that it had been taken already.