The Scottish musician goes on to claim that West - who has a 19-month-old daughter North with wife Kim Kardashian West - made a "mockery" of the music industry when he ranted that it was "disrespectful to inspiration" for Beck to be given the accolade.
She continued: "You make yourself look small and petty and spoilt.
"In attempting to reduce the importance of one great talent over another, you make a mockery of all musicians and music from every genre, including your own. Grow up and stop throwing your toys around. You are making yourself look like a complete t***."
The red-haired rocker went on to insist that Beyoncé - whose self-titled 2013 album lost out to Beck's Morning Phase - didn't need him to speak for her.
Shirley added: "P.S. I am pretty certain Beyoncé doesn't need you fighting any battles on her account. Seems like she's got everything covered perfectly well on her own."
Meanwhile, Beck claims he wasn't upset with West for ruining his big night as he was "so excited" to have him join him on stage.
He said: "I was just so excited he was coming up. He deserves to be on stage as much as anybody. How many great records has he put out in the last five years right? I still love him and think he's genius. I aspire to do what he does."
West's latest rant comes six years after he interrupted Taylor Swift's speech at the 2009 Video Music Awards to claim Beyoncé's Single Ladies should have won over her You Belong To Me in the Best Female Video category.
- Bang! Showbiz
