AIO? Guy I was talking to told me his biggest mistake

So I was talking to a guy and planning a date. We had only been talking for a few days when this happened.

We were FaceTime to see if we vibe. We did. But then we reached a point in the conversation where we were talking about our biggest mistakes. Mine, admittedly, was seeing a married man. And I told him how it had changed my life and changed my morality and helped me to get to know myself better but it was a horrible thing to do and it was a big mistake.

Well, then it’s his turn. And he says it was horrible and he’s a giant asshole for it, but he doesn’t want to tell me what it is. So I say that’s fine. But then somehow the conversation loops back around to this. We are on FaceTime and I’m looking at him. He’s laughing through telling me the story

He was dating a girl some years ago, and they got drunk at his house and had sex in front of her child who was under the age of six. He said that in the morning they woke up to the little boy dry humping his mother. And it just seemed like he was leaving out a lot of details and I was immediately disturbed

The fact that someone would have sex in front of a child is horrendous. I have children, I would never even take my children around someone when I was dating, let alone have sex in front of them. I think it takes a very depraved human to do that. So I said I had to get off the phone and after about 10 minutes I texted him and told him that I thought that that was vile and horrible and I hoped that that child had gotten therapy and that I thought he was leaving out parts of the story and it sounds like they did something to that child and he was a disgusting human being, and I was never going to be talking to him again.

His response indicated that I was overreacting. Then he told me I was psychotic, and I told him that I thought he was verging on pedophilia. To have sex in front of a child and then have that child emulate that behavior. That’s disgusting.

Am I overreacting?