The article is titled Why I don't discuss politics with friends but it doesn't explain the why? Unless I missed it. It seems to just talk about the challenges.
Why don't you discuss politics with friends? Are you worried about loss of friends? Do the conversations ruin your day? Do you feel alienated?
Depending on the why, there's different points I'd argue for or against the reasoning. Without that piece, it's kind of hard to discuss the premise of the article without just guessing its implications.
This sentence was intended as that answer, but I guess it wasn't clear enough:
"And this is fundamentally why I don't discuss politics with friends.
It's not that I don't want or am scared of opposing views (in fact the opposite is true[8]), but rather because of how common others’ desire to "remain in the bubble" is."
I actually am willing to risk alienation to find people that enjoy this sort of discussion-based discovery as much as I do, but found most people I encounter don't actually want that -- so I try and respect what seems to be the average opinion.