While CM Punk's first fight in the Octagon has yet to be determined, he got into a verbal battle with a fan at a UFC Q&A session in Las Vegas on Friday.

The fan said he has spoke with Punk and his sister on Twitter and has asked him for a fight in the past.

After the fan introduced himself and said he was from Twitter, Punk interrupted him.

"You might remember me from Twitter," Punk said, "might be the greatest Troy McClure that The Simpsons never used."

The fan replied, "Are you finished?"

"No, I'm here all day," Punk said. "But guess who's finished? You are, bye-bye, bye-bye."

The fan then continued to rant about how Punk's sister told the former WWE Superstar to "stay away from the Mexican kid."

"Oh you're a Mexican?" Punk asked. "I feel bad for all the other cool Mexicans I know. See ya, dude."

The host of the Q&A then interrupted and told the fan it wasn't what the platform was for and that he was wasting time for other UFC fans. He then asked if Punk would fight him that night and if he was scared to fight him.

"Are you a UFC fighter?" Punk asked the fan. "I'm on the stage b---h. Get the f--k out."

The microphone was then cut off to end the sparring session.

In other Punk news, he recently threw in his two cents about the ongoing Hulk Hogan racism scandal on Twitter:

Punk said he's aiming for his first UFC fight at the end of 2015 or in early 2016. Odds are it won't be against this unruly fan and Twitter troll.

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