The argument was not going to go anywhere and probably only deteriorate further.
I'll agree with Dante on this. If it's a circular argument and you're caught up in it, your best bet is to stop it. It's likely that they will react in a way that we don't expect when we do something differently. Why wouldn't they? When the rules of the game change, the players have to do things differently and that can be a bit scary for everyone. Change is difficult.
I know the feeling of self-doubt and I can't tell you not to feel it~~just know that you are doing what you need to do to take care of yourself and break a cycle of dysfunction.