On Tuesday, Mr. Peters delivered a letter to the local newspaper, saying that he attended the rally to protest what he viewed as political correctness. He added that he believes the Confederate symbol “has nothing to do with racism, and everything to do with embracing and celebrating the simple lifestyle that is the country boy/girl.”

‘Wasn’t Meant to Be Racist’

John Sousa, a high school teacher and golf coach in Wesley Chapel, Fla., was suspended from work after students accused him of telling a group of black classmates, “Don’t make me call Donald Trump to get you sent back to Africa.” The school district is investigating the episode.

Mr. Sousa did not respond to requests for an interview. In a Facebook post, Donnie Jones Jr., a Wesley Chapel High School parent, said he had spoken with the teacher on the phone. “He actually admitted saying it,” Mr. Jones wrote online. “He said it was just an off-the-wall comment and wasn’t meant to be racist. He said it was a bunch of male and female students in the hallway and he was talking to everyone.”

‘We Had No Idea’

Edward Tomasso and Parker Rand-Ricciardi, students at Babson College in Wellesley, Mass., drove onto the nearby campus of Wellesley College flying a Trump flag from their vehicle and chanted Mr. Trump’s campaign slogans outside a building where minority students can seek support. They bragged about the episode in an online video that has since been taken down. But after facing a backlash that included death threats on social media and a harsh response from officials at both schools, each posted an apology on Facebook and denied targeting minority students.

“Publicly celebrating the election at a time and in a place when so many were deeply disappointed about its outcome and, indeed, genuinely grieving about it, was just not smart,” Mr. Rand-Ricciardi wrote. “We had no idea that our actions would be interpreted as racist, or sexist, or harassment.”

Mr. Tomasso wrote: “As a white male, I do not feel threatened by the new president. I have not had to work for that privilege. It was something I was born with.” He included a phone number and email address where he said those he had offended could reach him directly. Quickly, though, angry comments — along with a few written in support — inundated the post, and Mr. Tomasso stopped responding. Neither Mr. Tomasso nor Mr. Rand-Ricciardi responded to requests for comment.

An Altercation With a Trump Supporter

Shacara McLaurin, a singer and anti-bullying activist in New York, said that she was walking home after a performance last week when she passed a political protest, and an elderly man who supported Mr. Trump began to heckle her. After a physical altercation in which the man fell to the ground, Ms. McLaurin, 23, was charged with assault and harassment.