I agree with the decrying of polarization, but this is revisionist history. Identity politics can be traced back to the 60's and 70's and have been incubated by far left (Marxist and progressive circles) for decades. Clinton was the last Democratic president who could be considered "liberal" instead of "progressive," whereas the Obamas were completely and proudly progressive. Joe isn't anything but an idiot, but his staff are all loyal Obama adherents.
The "far right" identarians would be the white nationalists I guess, but the difference is the establishment right, Republicans, have never embraced the theories or promoters of white nationalism, whereas the left, Democrats, still heroize the grifters of critical race theory and their new scam, "equity."
What you are seeing on the right is the response to unfairness. Fear, rage, and a retreat to tribalism. The tribe can be anything, but since the attacks from the left have been focused on race, the tribe of being white is seeing a resurgence. That should have been obvious when Obama said Trayvon Martin could have been his son.
The Right's last unrighteous cause was the restrictions against gay couples. That fight is over, the Republicans lost, though curiously the most alarmist claims about the gay rights movement targeting children seems to have come true, if you accept that the trans movement is a branch of the gay rights movement.
Either way, Republicans have not made an explicit claim that we are not, in fact, equal. Democrats have, and we are paying for it more each day.