When The Washington Post published a profile last week of Richard B. Spencer, a prominent leader of the so-called alt-right, readers were quick to respond. By Monday, the article had drawn more than 2,600 comments.

Many of them had a similar message.

“Please, please stop referring to a white Christian supremacist movement as the ‘alt-right’ — a phrase that sounds like a subgenre of rock music,” one reader wrote.

Another was more pointed: “STOP CALLING THEM ‘ALT-RIGHT.’ THEY ARE RACISTS, WHITE SUPREMICISTS, NAZIS.”

With the election of Donald J. Trump — and his subsequent appointment of Stephen K. Bannon, a former chairman of the right-wing website Breitbart News, as his chief White House strategist — the term alt-right has emerged as a linguistic flash point. Generally deployed by news organizations to describe a far-right, white nationalist movement known for its aggressive online expression, the term has attracted widespread criticism among those, particularly on the left, who say it euphemizes and legitimizes the ideologies of racism, anti-Semitism, Islamophobia and white supremacy.