Such videos predate Trump’s presidency and have proliferated this summer in places where he’s popular and reviled. Race, however, has been an overt component of Trump’s ascendance. On the campaign trail and in the White House, he has spoken about race in ways that would have been disastrous to almost any other politician. White House press secretary Sarah Huckabee Sanders has defended the president as an “equal opportunity” insulter, but his gibes follow a pattern — forgiving toward whites and unrelenting when it comes to minorities.

Nearly 20 months into his presidency, Trump’s insults are changing the way neighbors see each other, treat each other and talk about one of the most sensitive issues in American life.

In Summerville, white and black residents have fought, often angrily, about the video and the woman’s actions that day. At the core of their disagreement is an argument over what constitutes racist behavior at a time when Trump and others are rapidly scrambling social norms.