"I'm in the news, sweetheart. I will (expletive) sue this place," McHenry said.
She lobs insults at the employee about her education, intellect and appearance.
"Maybe if I was missing some teeth they would hire me, huh?" McHenry said. "Lose some weight, baby girl."
The heavily-edited video was posted to the site, Live Leak, and quickly went viral.
McHenry, who is a Washington D.C.-based reporter at ABC13's sister network, ESPN, took to Twitter to apologize.
In an intense and stressful moment, I allowed my emotions to get the best of me and said some insulting and (cont) http://t.co/Wx37XF2QtM— Britt McHenry (@BrittMcHenry) April 16, 2015
"As frustrated as I was, I should always choose to be respectful and take the high road. I am so sorry for my actions and will learn from this mistake," she wrote.