Well done for having the conversation. it's unlikely to be fixed overnight, but if he's willing to listen, change can happen.
...didn't really have a response to the "day off" comment though
What did that mean? He doesn't think you need a day off? Or he was horrified he hadn't realised it before.
I've told this story before but I think it's illuminating. Dh had taken over as SAHD when I went back to work. And he certainly pulled his weight overall but like most working mothers, I was more than doing my share of the night times, chores etc etc etc....
At the time, he was in training for a marathon. He was also a bit precious about it (must get good sleep etc etc) as well as a bit of a faffer so would take forever to get moving etc. So Sundays weren't my best day, it has to be said.
One Sunday, he came in at 2pm. He'd "needed" rest, so had got up at 8. Then he'd faffed about and only left at 10:00. Then he managed to get lost on a 3 hour training run, turning it into a 4 hour training run. When he eventually came through the door, I was sitting on the floor with ds in the middle of the lounge, absolutely shattered. I looked up and just said to him, "I've been with the baby, alone, since he woke up at 6am this morning.... on mother's day." He was absolutely MORTIFIED and it completely changed things. I think we'd just sort of got sucked into this weird place where, if we were both "at home" I was the default. Even looking after DS when I was at work was almost like he was "helping me". And we were both a bit guilty of this thinking.
Things completely changed after that, because he's a genuinely good man who had been thoughtless and who was committed to not doing that again.