Bristol Palin got into a heated argument with a bar patron in Los Angeles Thursday after he called her mother, Sarah Palin, a “whore.”

Bristol, 20, was riding a mechanical bull at the Saddle Ranch bar and restaurant Thursday night when a heckler yelled out, “Did you ride Levi like that?,” referring to Levi Johnston, the father of Bristol’s young son. The man went on to call her mother, the former Alaska governor, a “whore.”

After being bucked off the bull, Bristol walked over to confront the heckler. A video of their exchange shows the two talking for several minutes about why he doesn’t like Sarah Palin.

Heckler: “She’s evil.”

Bristol: “Is it because you’re a homosexual?”

Heckler: “Pretty much. And why did you say I’m a homosexual?”

Bristol: “Because I can tell you are.”

Their back and forth ended when the heckler said, “You don’t look anything like Glen Rice, I thought you would,” referring to the allegations that Sarah Palin had a one night stand with the former NBA player.

“You’re right, you’re right, I’m half African American, you caught me,” Bristol said, before storming out of the bar with her reality TV show camera crew. She passed another group of hecklers on the way, one of whom yelled, “You’re white trash from Wasilla.”

Representatives for Sarah and Bristol Palin did not immediately respond to ABCNews.com’s request for comment.