Credit: Scott Legato/Getty Images; Daniel Boczarski/Redferns

Although it was Beck who was nearly interrupted by a classic Kanye West move at Sunday’s Grammys, Shirley Manson wants to give the rapper a piece of her mind.

The Garbage frontwoman wrote an open letter to West on her Facebook page Monday, calling him out for “making a mockery of all musicians,” including himself. Using words like “petty” and “spoilt,” she tells West to grow up and ends her letter with a mention of Beyoncé. Read the full letter below.