Estifanos Zerai-Misgun, a black Brookline, Mass., police officer, pulled up in an unmarked car and greeted his superior, a white lieutenant. He wasn’t prepared for the response by the lieutenant, who said, as he gestured at the vehicle, “Who would put a black man behind one of these?”

“I was shocked,” the officer later told a Boston news station about the experience. It was one of several derogatory racial comments he would hear on the job. It got so bad that he and a black colleague walked away from the force in 2015.

The statements they’d heard were offensive and at times threatening in the moment, but they also made the men fear for their safety at work in a broader sense: The black officers weren’t sure that the white colleagues who were so willing to antagonize them would back them up if they were attacked on patrol.

Even if Mr. Zerai-Misgun and his colleague were never directly physically harmed, the experience probably took a toll on their bodies. Perceptions of discrimination like those the officers experienced, as well as those that are less direct, may make us sick. And in the current political environment, with its high-profile expressions of racism, sexism, anti-Semitism, Islamophobia, homophobia and xenophobia, along with widely covered acts of hate and bigotry, countless Americans are at risk of this type of harm.