This is a badly defined definition slant imo.Thanks to Superglue
"Definition of identitarian - relating to or supporting the political interests of a particular racial, ethnic, or national group, typically one composed of Europeans or white people."
At its core it is basically tribalism when talking about left or right spectrum.
And we see it on this forum with the 'likes' we give members who we think have scored a point from the other side or who we define are aligned to our side.
Realistically we are slightly different shades of the same color, arguing over minutely differing points.
Authoritarianism left, or right is and should be the enemy.