I have disagreements with my dp regularly but it never gets even remotely heated. We just say a few sentences, strive to understand each other, adjust our perceptions if needed and then move on.
Hes says the wrong thing (as I'd put it - e.g. scoffing at something that's important to me, dismissing an accomplishment, being thoughtless about something I'm sensitive about) perhaps once a year. I get upset, go quiet, he instantly knows something's up and gets quite anxious about it. Hed never bring it up though, he leaves me to it. Once I'm ready (usually 30-60 min of thinking it through) I tell him what I'm upset about and he is mortified by how he came across, or by something he was thinking in error. He says sorry and as long as I feel he understands where I'm coming from, ie hes not just saying sorry to make it go away, I instantly feel better and we move on. He usually feels awful for a while, usually buys a gift to say sorry and I end up telling him it's fine and everyone says thoughtless things sometimes.
Hes never been upset with me about anything. I suspect this is because he struggles to identify his own emotions though. I expect as he gets older and more in touch with his feelings, he may one day feel upset with me for being similarly thoughtless, we all do it.
With my ex, well, my ex was like your partner. It was a nightmare. I tried everything. I definitely knelt on the floor a few times, he had similar complaints. My tone was always not quite right, my facial expression was unacceptable, I was critical, judgemental, you name it. But basically the real rule was, rvby was required to shut the fuck up and be grateful someone even agreed to marry her, iyswim.
Now in hindsight I see that he was someone who used chronic disapproval of me as a manipulative tactic to keep me under his thumb. He knew I wanted things to work and would try anything. So he made sure I was always trying to work to make things work, it kept me weak, sad, depleted and therefore at his heel at all times.
In a moment of clarity after we split he told me, he had broken my legs (metaphorically speaking) so I wouldn't run away.
I'm not sure you're going to get the result you want from this guy OP. Xx