Representative Joe Wilson, the South Carolina Republican who gained a measure of infamy after shouting “you lie” at President Barack Obama during a joint session of Congress in 2009, had that memorable catchphrase hurled back at him by a group of his constituents at a town hall event on Monday.

The audience at the event, held at Aiken Technical College in Graniteville, S.C., near the state’s western border, was antagonistic from the start, booing audibly as he stepped to the lectern. But the conflict between Mr. Wilson and the crowd came to a head toward the end of the 40-minute question-and-answer period, when he responded to a question about Mr. Obama’s health care law.

After he said the law was delaying and denying health services to its intended recipients, the rest of his comments were drowned out, as the crowd began to chant “you lie” in unison. The cheer continued for about 20 seconds. A video of the event was posted on Facebook Live.