Ignore them. They’re not going to change their mind about anything.

You could ask yourself why do YOU want to deal with that type of person. If they are an adult and not your responsibility, you are free to walk away when dealing with them is no longer entertaining. If they are a child and you are their parent/guardian I suggest early intervention with a good program like the one used in California and a few other states, called PMTO.

I’ve had to deal with this situation several times. I’ve come to realize that sometimes it’s better to just let them experience it and learn from it. It’s their choice after all. In my situation the person failed to learn anything, but it was still their choice after all so they should have no regret.

Stop trying to convince them that they’re wrong. Listen to understand, not to argue. Be curious about their ideas and equally curious about your need to change their mind.

It does not have to be a battle unless they control you in some way (i.e. financially). For example, I recently had a discussion about some gardening decisions with someone who has no say in it. I did have the urge to convince them that my way of thinking makes sense. But then I realized I don’t have to do that work. I sat back and fully listened. I now understand their position. I will still make my own decision, but it didn’t hurt me to help someone feel heard.

I recommend the book ‘I Hear You’ for learning how to validate. Validation is powerful and will often make formerly combative people into happy and peaceful humans. In my experience, people with that strong urge to argue are usually very anxious. When they feel heard, they can relax.

Don’t engage them . . .

“It is like trying to teach a pig to sing, it is a waste of time and it annoys the pig.” – - – Robert Heinlein

Some people are confrontational.
I have an older brother who will argue just for the sake of arguing.

HE feels better after chewing out others, I learned to shut him down as soon as his voice gest loud and demanding.

In phone calls if he starts this again I hang up immediately as in the past I told him outright

that if he begins to act like that on any future calls to me that I would simply hang up and

NOT talk with him for whatever time I choose.

Sometimes days, weeks before he calms down.

Note: That our father was like this and thus my older brother had learned it from him on how to treat others ( wrongly though).

To follow up my answer in the question you linked:

Unfortunately, you can’t convince them of anything outside of their belief and they have the right to vote. 8^(

Someone else’s path is none of your business.

Point & laugh until such point you acquire a mild dose of hiccups.