They didn’t appreciate Carrey parodying their sacred Woodstock during the ‘karaoke bash’.
Actually he was parodying Altamont.
“You might recognize this song as performed by Jefferson Airplane, in a little rockumentary called ‘Gimme Shelter,’ about the Rolling Stones and their nightmare at Altamont. That night the Oakland chapter of the Hell’s Angels had their way. Tonight, it’s my turn.”