In the end, this is the bulk of it. And the hell of it is, while it's immoral and shitty, it's not entirely irrational. Why? Competition.
In 1950, there was a pool of jobs for people of moderate skill and middling to decent intellect. Who was the pool of people who could be hired for those jobs? White males, almost exclusively. Truly, like 95% of those jobs went to white males, easy peasy.
Then...the civil rights movement (both culturally and legally). Now, black people, hispanics, etc. are the competition. Think of autoworker jobs. Surely at the end of WWII, those were 95% or more white males. By the 1970s, a shitload of those jobs were going to minorities. But wait, there's more: WOMEN.
Starting in the 1970s, women began entering the workforce - and colleges and universities -- en masse. So, for even the more "skilled" jobs....white males have to compete with women as well. Hell, I see this in my profession (legal) and my wife's (ordained, seminary-trained minister). College enrollment is 60-40 female to male. When looking at candidates to hire for legal jobs, or a seminary-trained job....the majority of the better candidates are female.
White males didn't get dumber, or less qualified, in general. It's just that EVERYONE ELSE was, over time, freed from social and legal encumbrances that kept them from openly competing for the work white men had reserved exclusively for them. There used to be 10 million sweet-spot jobs open every year, and white males - being the only legit pool of candidates - got 95% of them. Today, those same 10 million jobs are sought by white males, minorities (male and female) and women. Used to be that white males got 9.5 million of those jobs. Today, they only get 6 million of those jobs. From the white male perspective, they just LOST 3.5 million jobs. And, mathematically, they're not wrong.
The TLDR version: When you're accustomed to privilege, equality feels like oppression.
To take it to the question, asked in callous and insulting manner as is the Surly way, what are we going to do with our mediocre white males? Because....relative to where they were 75 years ago, even 40-50 years ago....they're taking it in the shorts. And they are, in an understandably human way, pissed about it.
I wish. The supply of Dunning Kruger "Conservatives" is near limitless. It is America's greatest natural resource.