It's not totally new.
But it's gotten worse in the past 15-20 years.
It's not as bad as, say, right before the Civil War.
But it's a lot worse that, say, the 50s or 60s.
I've heard an interesting idea on why that is.
In the 50s, many people who were in positions of power, particularly in government, were WW2 veterans.
They had personal experience in working with all sorts of different people. People they may not have agreed with, may not have even liked.
But they had a shared goal.
And worked together to achieve that goal.
In government, while there was still a lot of disagreement, many (not all) of the leaders continued with that overall philosophy.
In the years since, the WW2 vets have died off, but have been replaced in part with vets from the Korean & Viet Nam wars.
John McCain was an excellent example of this.
He was willing to listen to, work with, and help out people who were his adversaries.
They were 'opponents', not 'enemies'. McCain had personal experience with real enemies.
We no longer have a significant number of veterans with actual 'wartime' experience. Tammy Duckworth is the only one that comes to mind.
And, while she's gone after the Trumpettes pretty hard, she's going after those who treat her as the enemy. Not those who just disagree with her.