Katy Perry’s “mental health” joke uttered on the Grammys red carpet didn’t sit too well with Britney Spears fans. An army of them say Perry cruelly referenced the pop star who shaved her head almost a decade ago while in the midst of a mental breakdown.

“We’re demanding you issue an apology to Britney Spears. 1500 words minimum. MLA Format. Submitted via instagram. Due by midnight,” wrote one user on Sunday.

“@katyperry U should apologize to @britneyspears. Shame on u Katy. She never shades anyone,” wrote another.

Also Read: Katy Perry Throws Shade at Britney Spears at Grammys: 'I Haven't Shaved My Head Yet'

At the Grammys, Perry was talking to Ryan Seacrest on the red carpet when Seacrest asked her about taking a break between albums. She responded, “That’s called taking care of your mental health.”

When Seacrest then followed up about how her time off had been, Perry said, “Fantastic. And I haven’t shaved my head yet.” In another interview, the “Chained to the Rhythm” singer talked about her hair, saying “I’ve done all of them and the only thing left to do is shave my head, which I’m really saving for a public breakdown. I’m down for that. I’m almost moments away from that, obviously.”

Spears was seen shaving her head during a public meltdown after leaving a rehab facility in February 2007.

Also Read: Grammys: Katy Perry Channels Hillary Clinton, Elizabeth Warren in Performance

But Perry and Spears have a history of, if not friendship, collaboration — leaving others to speculate whether the “Part of Me” singer simply made a poor choice of words, not intending to disparage the “Slumber Party” pop star. Perry appeared on the song “Passengers” for Spears’ eighth studio album, “Britney Jean.” The duo wrote the song with Sia, Andrew Swanson and Diplo.

Representatives for Perry and Spears have not yet responded to TheWrap’s request for comment.

See tweets about Perry’s comments below.

We're demanding you issue an apology to Britney Spears. 1500 words minimum. MLA Format. Submitted via instagram. Due by midnight. @katyperry

— Cody (@codyspearz) February 13, 2017

@katyperry U should apologize to @britneyspears. Shame on u Katy. She never shades anyone.

— Veronica (@Ashaly91) February 13, 2017

It's absolutely shameful that @katyperry would say something so insensitive about Britney Spears's mental health.

— Johnny Christ CH (@DjFinalTrip) February 13, 2017

Actual footage of Katy Perry reaching for attention with these Britney/Mental Health jokes #KatyPerryIsOverParty

P.S her outfit is puke pic.twitter.com/iotVXiznes

— Bonnie (@KiwiDollYT) February 13, 2017

When @katyperry says she took a mental health break but shades Britney's hard time. Good luck with your new album. #GRAMMYs

— Brittany Wurfel (@missbwurf) February 13, 2017

When @britneyspears lowest moment is more iconic than your whole career @katyperry pic.twitter.com/6bFmuTivar

— Jean-Pierre SOUAIDAN (@JPSDN) February 13, 2017

Ok so Katy Perry is cancelled.

— Matt Stopera (@mattstopera) February 13, 2017

Katy Perry mocking Britney on the red carpet. Not cute! Good luck with that new single, sis!

— T. Kyle (@tkylemac) February 13, 2017

Katy Perry just dead ass made fun of Britney's breakdown not once, but TWICE on the red carpet. What a trash can.

— kara nichole. (@karmandabynes) February 13, 2017

Katy Perry making fun of Britney's mental breakdown at the #GRAMMYs Red Carpet. Yikes. That was so wrong.

— Paula | Lady Gaga (@Paula_PawsUp) February 13, 2017

Did @katyperry just take a jab at @britneyspears …NOT cool….I do not support women bashing women and she shouldn't either #GRAMMYs

— Samantha Barham (@samantha_barham) February 13, 2017

Absolutely disgusted with @katyperry. Who is she to attack @britneyspears about mental health?! Officially done with Katy. #KatyIsOverParty pic.twitter.com/dPLeaHhfe8

— Matt (@snowstorm674) February 13, 2017

Talking about her mental health, Katy Perry said "well, I haven't shaved my head yet" in a reference to Britney Spears… Tragic.

— Tegan Wayne (@TeganZayne) February 13, 2017

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