WASHINGTON — NASCAR is demanding that its fans no longer fly Confederate flags at races. The Pentagon and some Republican senators are open to renaming military bases that bear the names of Confederate soldiers. Corporate America is taking stances against racial injustice. A majority of Americans say the police show racial bias in their use of force, and a majority of self-described conservatives acknowledge protesters’ frustrations are at least somewhat justified.

Yet with public opinion shifting quickly on racism in America, and even some of the most cautious leaders and institutions talking openly about discrimination and reconciliation, there is still one glaring outlier: President Trump.

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Whether it is suggesting shooting protesters or siccing dogs on them, pre-emptively defending the Confederate names of military installations or arguing that his supporters “love the black people,” Mr. Trump increasingly sounds like a cultural relic, detached from not just the left-leaning protesters in the streets but also the country’s political middle and even some Republican allies and his own military leaders.

While Mr. Trump has a long history of making insensitive and tone-deaf comments on race, including remarks widely seen as racist, he has never appeared more isolated on a dominant social and political moment in the country, hunkered down at the White House tweeting conspiracy theories about injured protesters and describing demonstrators as “THUGS.”

He regularly uses harsh and violent language that no other American leader employs, vocally supporting the views of white nationalists and even defenders of white supremacy rather than the views expressed by majorities of Americans in polls.

“He’s talking as if this is a country in the 1950s and not 2020,” said Levar Stoney, the mayor of Richmond, Va., where a multiracial group of protesters has prompted the city and state to take down Confederate statues.