Possible Clues:

• "Don't care what they do"
• "___ Eat Cake" (Gershwin musical)
• “Who cares if they do?”
• "Whatevs, they can do it"
• "Who cares what they do"
• "I don't care what they do"
• 'They can go right ahead!'
• 'They should just go ahead and do that'
• "So what if they do?"
• "They're gonna do what they're gonna do"