Producer Mike Dean was apparently irked when Kanye West’s album Donda — which he produced — didn’t win the Album of the Year award at Sunday’s Grammys, and seemed to take it out on BTS.

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He responded to a tweet from the Recording Academy that read:

That single word (which he has since deleted) was enough to unleash the BTS ARMY, who descended on him en masse via Twitter.

Dean initially attempted to engage, mocking claims that BTS write “90 percent of their music,” and continued to dig in.

After a while, the relentlessness of the ARMY apparently became too much, and Dean responded with an all-caps apology to BTS:

He ended by admitting he was “mad about album of the year and made a post I shouldn’t have made”:

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