Earlier this week, we learned that a senior State Department official called Secretary of State Marco Rubio stupid. The insult was delivered using peculiar phrasing — “low IQ” — that’s actually quite telling about the nature and ideas of the American right today.

The official in question, Darren Beattie, is the acting under secretary of state for public diplomacy — a fairly important job. He is also a creature of the internet fever swamps with a history of offensive behavior: He was fired from his speechwriting job in the first Trump administration for giving a talk at a white nationalist conference.

On Monday, CNN’s KFile went through some deleted tweets from Beattie’s X account. Among many inflammatory statements the reporters uncovered, one stood out as especially embarrassing — a 2021 post where he insulted his now-boss in a number of vivid and explicit ways. On the list: a claim that the current secretary of state was “low IQ.”

For a normal person whose brain has not been poisoned by the internet, “low IQ” just sounds like an overly complicated way of calling someone stupid. But for those of us familiar with the online world from which Beattie hails, it rang a very specific bell. In those spaces, there is an obsession with the concept of IQ — not just intelligence in general, but this particular means of measuring it.

This preoccupation, is at its heart, about race: the idea that genetic racial inequalities in everything from income to incarceration are best explained by Black and Latino people having lower IQs than white and Asian people. This racism, recently repackaged as “race realism” or “human biodiversity,” was once mostly a province of the........

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