Labrat, I'm sorry if this hurts or isn't helpful, but I feel like someone has to say it. The fact that your therapist was so resistant to identifying that your childhood was worse than average, which we all know (even you, if only on a rational level) is really concerning. I try not to throw around the transference/countertransference labels a lot, as they are often used to distract, avoid taking responsibility, and invalidate. However, it really seems to me, judging by what you've said, that your therapist is having some sort of abreaction. There is really no reason that he should have avoided validating your childhood as worse than average.

Edit: Unless you specifically asked for his feedback on your childhood in comparison to his other clients.