"I don't understand why people care so much about what I say in interviews? Do y'all watch the news? Don't y'all got s**t to worry about? (sic)"
In the interview, Demi, 24, hit out at Taylor and her squad - which includes Cara Delevingne, Ellie Goulding, Gigi Hadid and Karlie Kloss - for using her 2014 song and video for Bad Blood to reference her feud with 31-year-old Katy.
Demi, 24, thinks Taylor - who is an outright feminist - failed to empower other women by teaming up with her pals against the Roar hitmaker.
Talking about the video, she said: "I think that having a song and a video about tearing Katy Perry down, that's not women's empowerment."
The brunette beauty also criticised the video for only using women with extremely thin bodies, which she says gives young fans the wrong impression of what they should look like.
She added: "This will probably get me in trouble, but I don't see anybody in any sort of squad that has a normal body. It's kind of this false image of what people should look like."
Lovato announced earlier this week on Twitter that fans will see less of her next year.
"Taking a break from music and the spotlight," she wrote. "I am not meant for this business and the media."
Katy - who has long been rumoured to have an ongoing feud with Taylor - recently showed signs that she is ready to make up with the 26-year-old pop star by offering to collaborate with her if she apologises.
The Dark Horse hitmaker seems happy to end her ongoing feud with Taylor and has held out an olive branch by announcing that there is a chance they could work together in the future.
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When asked in a Twitter Q&A if she would work with Taylor, Katy replied: "If she says sorry, sure!"
The two singers have had an ongoing feud ever since Taylor claimed the Unconditionally singer pinched three of her backing dancers from her RED tour in 2012.
- Bang! Showbiz