My boyfriend said I’d be a terrible mother

I don’t know what to do. I'm 34 weeks along now. What happened was my partner and I were discussing discipline in the car when he was dropping me off at home. And we got to a point where we landed on the peculiarity of disciplining an adopted child since we also decided in the future we’d adopt a kid. I made a remark on a funny cliché phrase used by some adoptive children in their rebellious times "you're not my real mom/dad". To which his reply was if our adoptive kid would say that, he would: Cook, but then say to the child "If I am not your parent than I have no obligation to feed you" and perhaps let him eat from it, and when he would go to sleep, to turn off the air conditioning and say "I don't have to pay electricity for you if I'm not your parent. You should be grateful that I allow you to sleep here" etc. and said that it'd be a good lesson. To which I disagreed and said that it was way too harsh of a punishment for, say, a 6 year old. And then fro that, landed on the old custom of utilizing a belt. I said it was abuse, and he said "I used to get hit with a belt. Are you saying I'm abused?" and I said yes because under the PRESENT law, that is considered abuse. Even though back then, it was not. And then back to the adoptive child thing, He said it was "righteous punishment" and I said it was extreme to do that to a 6 year old. And then he went on to say and I quote "You will be a terrible mother". To my shock, I said "Excuse me?" and he said that I would be a terrible mother because I do not understand what it means to discipline the child, that if I did not do that, our child would not respect me and do whatever he wanted. And then said "You know what? Don't count me in the discipline of our child. When he's out with me he will do whatever he wants. I'm not gonna take part in any punishment. You do whatever you want. Whenever he gets in trouble, you handle it. If you are scolding him, don't include me in the conversation. If he ever asks for anything I'm gonna send him straight to you. You raise him however you want and when he starts rebelling and doing wrong I'm not gonna partake in his punishment. When he f***s you over, it'll be your problem. You will be the one that will be screwed handling it.". I want to point out that this "argument" like he called it, was not disrespectful at all. I had not raised my voice at him or interrupted him or anything. We had issues with the discipline talk once before, because he was okay with the child cursing at home or with friends and I was not, because I don't think small children should curse. I just sat there after he said that in the car. I didn't talk or anything the whole time I was in the car I was just thinking what the heck I was gonna do now with him. That was such a disrespectful thing to say. And yes, we do have a problem because I do think his punishment is way too harsh and I also do not believe in hitting my child with a belt or at all for that matter. And after a while of just sitting there thinking he goes "What?" and I say "I didn't say anything" and he responded "Exactly. You're not saying anything. If you're gonna sit there then at least say something otherwise you are just wasting time and gas." to which I asked "Wasting time and gas?" And he said "Yeah. You're sitting there saying nothing. So you're just wasting gas with me stopped here in silence.". Basically throwing me out of the car if I refused to talk. But I just felt sitting there was better than coming into the house in the state we both were. I am at such a loss. I can't even believe he said that to me. I really really dont know what to do. I'm having a hard time imagining myself moving in with this person and getting married and now I'm even uneasy at the thought of having this child with him. But mostly, that was just so disrespectful to say I am going to be a terrible mother...