this, in my opinion, is just cultural change. politically motivated of course, but nonetheless, political. Democrats, having portrayed themselves as working for the working class (blue collar/union workers) wanted to collect the majority voters, obviously. Seeing how younger generations were going to college and obtaining those useless degrees, had become ardent liberals, democrats walked away from the working class, with only minor support for unions............they saw where the majority of voters were. Trump and the republicans knew they were never going to get the younger vote because of stubborn arrogance of the youth. It's why Trump lost in 2020.
Identity politics is the rage now and most likely will be that way for another 8 to 10 years............