Dont worry, he only said it to make you feel better, perhaps he is not very sensitive. You know it was not the best you could have done, but as a producer he must have thought it was good enough - his reputation is on the line also. I should just mark it down to experience. I do know how you feel - a similar thing happened to me, and I felt really pissed off for a while. Play some music very loud, have a decent glass of red wine and ring a good friend and have a moan