The comments came while the diva and "Mariah's World" star appeared on "Watch What Happens Live" on Sunday after host Andy Cohen asked Carey about comments Lovato made on Twitter in June.
"Demi Lovato, I didn't know this, she kind of shaded you on social media," Cohen explained to Carey. "She made assumptions about Ariana Grande, and she said, 'Mariah's a legend and she's so talented but she disses people. It's nasty the way she treats [Jennifer Lopez].' What would you say to Demi?"
"I don't know her either and so I wouldn't say anything to her," the singer replied, a callback to comments she famously made about not knowing Lopez which caused Lovato to speak out on social media.
"She should come up, introduce herself to me, say, 'Here's my opinion, what do you think about it?' That's how you handle [expletive], okay?" Carey continued.
The 46-year-old was then asked if she knew Grande and delivered a similar response. "No," she said. "I don't know... Honestly, I'm not familiar. I listen to hip-hop more than I listen to pop music."
Notably, the interview also featured Carey dodging questions regarding her recent breakup from James Packer and rumored romance with backup dancer Bryan Tanaka.
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