Political polarization is an active choice made by right-wing media in the US. Creating dissension and outrage is the bread and butter of Fox News, OANN, etc.
I never watch TV and especially not news on TV, except when its a major debate that they're broadcasting, I always go for raw unedited sources. So if there's a White House announcement, through every presidency I just go to the White House youtube livestream no commentary, just the raw announcement / press briefing (I did this through all of Trump, Biden and now Trump again, though I've decided to take a break, I'm exhausted mentally). So many years ago, I was in a relatives home. They turn on the news, no big deal. I hear what sounds like a news reporter screaming and whining, I dont pay attention for about 5 minutes because I'm busy reading something on my phone, but I notice it. Then I finally look, and I had no idea what leanings they had at the time since I never watch news but it was CNN and she was saying all sorts of things about Trump in what was very obvious anger (why any organization that calls itself News / Journalistic would ever do this is beyond me). I don't think the hateful rhetoric is exclusive to one side. I think the mainstream media is pushing poison on both ends and any time something tragic happens in either direction I always see clips of news reporters from either side saying the most vile things, regardless of what the issue is or who it affects.
In my eyes, TV journalism is mostly dead. I rather stick to local stations that stay focused on things that affect me most directly.