Unfortunately this is part of the illness. Disputes or corrections cause terrible behavior sometimes. We can be the enemy or the person they don't know at times. Save your breath. It is not worth you feeling badly. It is the frustrating part that I have trouble with. I just stop talking. If he gets ugly, I usually leave the room. He has forgotten actually what he said or that he actually was talking about. Write in a diary or find something to keep him busy. You will always be wrong. Make sure you do something that gives you joy. Hardest job you will ever have and did not ask for.
Keep your loving attitude and let him know you love him. He may not remember..but you will be able to live with yourself. I have been in conflicts and nice conversations. Hugs and prayers