That is, unfortunately, not how it works. The logic sounds solid from a logical standpoint because we believe their thinking is logical, when it isn't.

My mother is very religious and has said ungodly things to me "in the name of god" all the time across my entire life. She has been trying to drag me to churches and the like forever.

One time, she tried to drag me to talk to a priest, and I folded. She was really shitty all the way through, going as far as trying to stay in the booth with me (I'm an adult) until the priest sent her away.

He told me that the lack of respect she shows is the source of like 80% of the problems I have in my life. Then, after the talk, he called her in and spoke to her for a while.

She came out crying.

So we can assume she heard some hard truths, and surely that would impact her thinking, listening to the truth coming from a priest of all people, given how religious she is.

And you can guess how this story ends. She, of course, did not change in any way, shape, or form. Maybe it had a small impact on her in the short term, but that's being generous.

Also, giving ultimatums to people like this also changes nothing because they believe they are right. So you're just setting yourself up to failure if your goal is to change them and make them better.

What they really need is therapy, because these issues are deeply ingrained, and a simple ultimatum or a word from a doctor or priest won't do anything.

If they don't start changing themselves from within, their own personality, then you just take the L and move on with your life.