“Common hatred unites the most heterogeneous elements.” —American philosopher Eric Hoffer

Something repellently “uniting” is emerging from the more feverish fever swamps of progressive ideology: White Americans should either feel ashamed, guilty or apologetic — simply for being white.

That’s the premise behind “White Racism,” a course taught by professor Ted Thornhill at Florida Gulf Coast University. Thornhill believes a color-blind society is “a myth” that keeps both whites and misguided people of color “from recognizing the everyday realities that show the United States is white supremacist in nature.”

Unsurprisingly, Thornhill has a decidedly one-sided view of those who colonized America, insisting they “practiced all manner of inhumanity against non-whites,” including “genocide, slavery, murder, rape, torture, theft, chicanery, segregation, discrimination, intimidation, internment, humiliation and marginalization.”

That every group of human beings was guilty of all manner of inhumanity at various times in history? That Thornhill has a platform on a college campus and in the media to disseminate his twisted worldview, due to those same colonists establishing a republic where freedom of speech remains a bedrock principle? That they wrote a Declaration of Independence and Constitution establishing inalienable human rights that laid the groundwork for ending inhumanity best exemplified by slavery — slavery practiced by every ethnic group — at a cost of 360,000 lives? That this nation has gone even further, establishing affirmative action programs that continue redressing inequality, or the pernicious concept of disparate impact that presumes discrimination even where none is evident, based on nothing more than disproportionately negative impacts on protected classes of individuals?

Thornhill insists American is little more than a nation “comprised of laws, policies, practices, traditions and an accompanying ideology … that promotes the biological, intellectual and cultural superiority of whites to dominate other groups.”

What about non-white racism? Thornhill concedes non-whites can have “prejudices,” but racism accrues solely to whites because they are beneficiaries of “systemic privilege.”

Such mindless absolutism might surprise many whites whose systemic privilege consists of enduring decades of Rust Belt hopelessness — sometimes relieved by tuning into multi-millionaire black athletes taking a knee during the Star-Spangled Banner portion of an NFL football game. Yet for those who believe skin color is the sole arbiter of privilege, it is not surprising.

It’s not new, either. Critical Race Theory, a philosophy established by Harvard professor Derrick Bell, has long asserted that America is a permanently racist nation whose legal structures are invalid because they are designed to support white supremacy.

Meritocracy, equal opportunity, and colorblindness? Nothing more than illusory concepts used to maintain the racist status quo.

Another club in the assault on whiteness is “cultural appropriation,” as in the idea that the dominant culture inappropriately adopts or utilizes elements of a minority culture — with the attendant subtext that such appropriation is driven by colonial impulses, and an imbalance of power violating the “collective intellectual property rights” of the minority culture.

This separatism-on-steroids is another one-way street whereby certain aspects and/or manifestations of culture are reserved solely from minorities, even as those minorities are free to embrace any aspect of the dominant culture, absent similar recriminations for doing so.

And in a nation where progressive ideology far too often substitutes for a genuine education, such contemptible nonsense is becoming part of the classroom experience. “Social justice activists at a New York high school successfully shut down a production of ‘The Hunchback of Notre Dame’ after a white student landed a lead role,” Fox News reports.

The protests began when Maddi Carroll, a black 17-year-old senior, quit the production as a result. “It shows you that theater wasn’t made for you,” she insisted. “And it shows you that, if you can’t get the parts that are written for you, what parts are you going to get?”

Perhaps the role of Angelica Schuyler, a white woman portrayed by 2016 Tony Award winning actress Renee Elise Goldsberry in “Hamilton,” the hit Broadway play where the nation’s white Founding Fathers were also played by minority actors.

Regardless, students banded together in a group called Students United Ithaca, and they wrote a letter that reveals how twisted their thinking has become. While they insisted the white student who landed the role “is a stellar actor, singer, and dancer” that “any stage, would be lucky to have” she is nonetheless the “epitome of whiteness.” Thus, casting her in this role is at best “cultural appropriation,” and at worst “whitewashing, a racist casting practice which has its roots in minstrelsy.”

The group doubled down on its Facebook page, posting a list of demands aimed at the Ithaca City School District. Two of them stood out. “STOP the racist and openly stated policy of ‘color blind’ casting in the ICSD,” stated one. “STOP ignoring and denying that you have created a white centered program run by white adults for the benefit of white children. White children should also be educated about interrupting these practices of White supremacy,” stated the other.

In other words, meritocracy be damned, along with anything else that doesn’t accord itself with progressivism’s racialist, bean-counting, cultural fiefdom worldview.

Moreover, when color-blindness is deemed racist, that worldview is plumbing Orwellian depths.

But, but, but… acting, singing and dancing talent is subjective and thus open to interpretation, right? “The U.S. Olympic Committee says it’s taking its most diverse team ever to a Winter Games, an impressive and deserved boast that requires a caveat of sorts,” The Washington Post reports. “Yes, USOC officials are pleased the team includes more African-Americans and Asian-Americans — and even the first two openly gay men — than recent winter squads. But they also realize this year’s U.S. Olympic team, not unlike those of most other nations gathering in Pyeongchang this week, is still overwhelmingly white.”

The paper added, “‘We’re not quite where we want to be,’ said Jason Thompson, the USOC’s director of diversity and inclusion. … ‘I think full-on inclusion has always been a priority of Team USA. I think everybody’s always felt it should represent every American.’”

One might be forgiven for assuming that full-on ability would be the priority for an Olympic team. Moreover, the notion that every American can’t be represented by any Olympian — utterly irrespective of ethnicity, sex or sexual orientation — reveals how obsessed the American Left is with identity politics.

“I have a dream that one day on the red hills of Georgia, sons of former slaves and the sons of former slaveowners will be able to sit down together at the table of brotherhood,” declared Martin Luther King in 1963.

Fifty-five years later, that dream is in danger of being exterminated by an American Left’s “common hatred” for America’s common culture. It is a common hatred that demands E Pluribus Unum give way to a hodgepodge of cultural fiefdoms where contempt for “the other” is the common currency, and where identity politics arrives at its most repugnant and virulent destination.

The destination where whiteness per se is tantamount to the Original Sin.