Arguing

My fiance and I argued this morning. He likes to always be bossy and somtimes I feel like I'm being treated like a nanny (to our one year old son) or a child. But he has been a little better. But this morning we wanted to go for a walk early. And most of the time even when he's at work. We feed our son a balanced breakfast. Every meal we do this. So I said I wanted to give him cereal and he said no and said because I go the easy route when he's not home. Thats not even true. I told him to please stop assuming. And so I gave him cereal and I was going to him some other things but there he hands me what he thinks I should give him and I let him know I already had something I mind and he said I should give him that. We went back and froth and he said he'd listen to ideas when they make sense ( he doesn't even know what I'm going to give him) and so we disagreed and I had to rinse my hands because some food for on my hands and he was getting something over the cabinet and I rinsed them real quick and shook my hands and a drop of water got on him and he called me an asshole because water got on him. I get we are arguing and I just don't know about being called out of my name. And I told him to not call me that and he said that if I'm acting like one he's going to call me that. I don't know what to say or do.