I am not fomenting polarization, I am recognizing that it exists, and why.

You overlook several key factors

1) the polarization has already been created and is being deliberately magnified

2) this is being done by a set of RW leaders, authoritarians, and some media, each for their own reasons

3) A primary tool that is being used is amplifying perceived grievances & racism and spreading desinformatsyia and distrust (where the goal isn't necessarily to get people to believe the BS, which is a nice bonus, but to get ppl to think the truth is unknowable because you can't trust anything).

>>at some point this opposition will be firmly against you because there is no way for political discourse

Have you bothered to look around? Coming from the right wing movements in US, Hiungary, France, GB, etc, is nothing but firm opposition. If you are not with them, you are the enemy. Just look at what comes out of Fox News in the US - who is the biggest enemy? Liberals. Not totalitarian states who murder their own citizens at home and abroad -- liberals, and independents who are not with them, even in The Big Lie that the loser of the election was the winner.

>>at some point you start to believe that any objection to your position is a flat earther.
No, that is an utterly false and reprehensible accusation. I'm happy to openly discuss anything, and have even done so with flat earthers.

The fact is that if a party to a discussion rejects facts, or is aggressively anti-science, i.e., anti-facts and anti-reality, there is no real basis for discussion.

More importantly, this is NOT some kind of balanced failure of both parties, but specifically the fault of party rejecting reality who is making real discussion impossible.

Merely recognizing a fact such as that does not make me or anyone else the cause of the problem. In fact, your failure to recognize the problem contributes to enabling it.

I am happy to attempt to talk to even the most extreme on any side. I have in fact repeatedly attempted to do so, including with people in my own family. But when the fact is that they refuse to accept objective reality — not that they don't have the intelligence to know, but they actively remain willfully ignorant — it fits a good definition of insanity to not recognize that fact.

>>at some point you start to believe that any objection to your position is a flat earther. Of course they are not, these beliefs aren't relevant to the tiniest degree.

Again the first sentence is false. And more importantly, the beliefs like "flat-earther", "NASA is a hoax", "chemtrails", "antivaxxer", etc. are anything but irrelevant.

The spreading of these beliefs is the exact tool used to breed distrust and polarization. It leads the followers to believe that truth cannot be known, so to blindly follow their leaders, and to believe that anyone not "in" on the beliefs is an enemy.

With this group and its leaders, ordinary political discourse is not possible, as there is not even a shared reality, and no argument is ever made in good faith.

Recognizing that this is already a fact is not furthering the polarization, it is recognizing reality, and is the first step to finding a remedy.

Anything less is simply enabling authoritarians.