Why is there still racism today in 2024?

In The New York Times Book Review in a review of A Young People's History Of The United States, volumes 1 and 2, novelist Walter Kirn wrote:

That America is not a better place—that it finds itself almost globally despised, mired in war, self-doubt and random violence—is also a fact, of course, but not one that Zinn's brand of history seems equal to. His stick-figure pageant of capitalist cupidity can account, in its fashion, for terrorism—as when, in the second volume, subtitled "Class Struggle to the War on Terror," he notes that Sept. 11 was an assault on "symbols of American wealth and power"—but it doesn't address the themes of religious zealotry, technological change and cultural confusion that animate what I was taught in high school to label "current events" but that contemporary students may as well just call "the weirdness." The line from Columbus to Columbine, from the first Independence Day to the Internet, and from the Boston Tea Party to Baghdad is a wandering line, not a party line. As for the "new possibilities" it points to, I can't see them clearly.

Professors Michael Kazin, Michael Kammen and Mary Grabar condemn the book as a black-and-white story of elite villains and oppressed victims, a story that robs American history of its depth and intricacy and leaves nothing but an empty text simplified to the level of propaganda.