Video from a Montana fly fishing shop shows a man berating Fox News host Tucker Carlson, calling him the "worst human being known to man."
In a post accompanying the video on Instagram, the man, Dan Bailey, accused the top-rated host of "Tucker Carlson Tonight" of killing people with vaccine misinformation and supporting "extreme racism."
In the brief video, Carlson responds to Bailey quietly, saying, "I appreciate that." At one point, Carlson appears to call Bailey "son" and starts laughing before he walks away.
A Fox News spokesperson said "ambushing" Carlson while he was at the shop in Livingston with his family was "totally inexcusable."
"No public figure should be accosted regardless of their political persuasion or beliefs simply due to the intolerance of another point of view," the spokesperson said.
In a statement, the shop, Dan Bailey's Outdoor Company, said the business was not related to the Dan Bailey shown in the video and added: "To be clear, we treat every customer equally and respectfully. Our staff was professional and cordial to Mr. Carlson, as we are with all of our customers."
The Anti-Defamation League, which tracks hate groups, has also called Carlson out for promoting or defending ideas embraced by white supremacists and conspiracy theorists.
In a letter in April, the group's director asked Fox News to fire Carlson, saying he was promoting the racist conspiracy theories. Fox News CEO Lachlan Murdoch responded that he stood by the host and said "Mr. Carlson decried and rejected" such theories, The Wrap reported.
Carlson has refused to say whether he has been vaccinated.