It's beef!

Machine Gun Kelly slated Slipknot onstage at Riot Fest over the weekend.

Slipknot's Corey Taylor criticised the singer during an interview earlier this year, doubting his credentials as a rock artist.

He said Machine Gun Kelly aimed to “take something that’s been around forever and then just basically rework it and call it new – even though it’s completely derivative”.

Machine Gun Kelly hit back onstage at Riot Fest in Chicago, sharing a bill with Slipknot.

He told the crowd: “You wanna know what I’m really happy that I’m not doing? Being 50 years old wearing a f***ing weird mask on a f***ing stage!”

Watch footage of the incident below.

Fans were quick to take sides:

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