That simmer is now boiling over (certainly in some circles), and the polarization/black and white thinking appears to be going global. It's a tough time to try to hold nuance and accommodate ambiguity. Especially when those yelling the loudest seem to be rewarded by our dysfunctional controversy-chasing media outlets.
There's certainly been times in history where discourse has been at similar levels, but I think we're going to need some strong course corrections here. Not sure how that's going to work, given the financial incentives to keep people angry at each other.
FPTP single candidate voting districts are just broken.
However, if you actually spend some time on the ground with advocacy groups, unions, non-profits, etc, you'll find the actual story is much different.
I am considered very left even in my country (France), and I had several discussion with people with various political opinion. If it got pretty heated sometimes, it was always respectful and never insulting.
Political discussion can get pretty heated, and thats normal. We could even argue that in a working democracy it should happen. But what I see on social media is people not listening to each other, constently insulting the other side, competing to be the most "left", "right" or whatever. Simplifying complex problem also and generally reacting with very little information.
This is a great way to lose. Again. Remember when Hillary, in her hubris, didn't campaign outside of big coastal cities? Those people exist and they matter. Acting like they don't is the best way to ensure they win again.
It is well understood that the local ground game in the months up to the election is what really wins.