> The working class abandoned democrats, not the other way around, when LBJ decided that the Civil Rights Act was a good thing, and got bipartisan support for it.
Odd, that the working class stayed with the Democrats for half a century after your claimed divergence.
It is true that progressive politics played a major role in the shift in the 2010s. But neither is that equivalent to the CRA, nor does it answer the question of why the working class reoriented around stupid bullshit. That latter, deeper issue has to do with the governing and professional classes of the US, which have shifted toward symbolic and procedural issues over broad material wellbeing, mostly because symbolic shit doesn't adversely affect professional classes' pocketbooks that much.
There is also the matter that the American political leadership managed to maintain some level of economic prosperity for the white working class in the intervening decades. Now that is collapsing, and the old narratives have returned.
The white working class and professional managerial class are in fact largely aligned in their zero sum assessments of the current situation. They differ principally on the nature of the solutions. No one on the left has the courage to acknowledge this, much less attack it.