Possible Clues:

• "Shake it off"
• Mantra in the face of criticism
• Adage popularized by 3LW's 'Playas Gon' Play'
• "Don't sweat the naysayers"
• 'Ignore the critics,' in modern parlance
• Message to critics
• Modern-day 'You can't please everyone'
• Words dismissive of detractors
• Tautology meaning 'I don't care what they say'