The backlash came as Miley responded to an open letter penned by Sinead showing concern that the former Hannah Montana star was being exploited by the music industry.
Miley responded to the letter on twitter, saying, 'Before Amanda Bynes…There was…' along with a screengrab of Sinead O'Connor's old twitter account containing tweets asking for psychiatric help:
Before Amanda Bynes.... There was.... pic.twitter.com/6JZPVnunPc— Miley Ray Cyrus (@MileyCyrus) October 3, 2013
Clearly furious, Sinead replied threatening to sue Cyrus, saying, 'You have posted today tweets of mine which are two years old, which were posted by me when I was unwell and seeking help so as to make them look like they are recent. In doing so you mock myself and Amanda Bynes for having suffered with mental health issues and for having sought help.'
'Remove your tweets immediately or you will hear from my lawyers. I am certain you will be hearing from all manner of mental health advocacy groups also. It is not acceptable to mock any person for having suffered,' she continued.
Miley responded that she was way too busy to deal with this right now as she was getting ready for her Saturday Night Live performance this week.
Sinead. I don't have time to write you an open letter cause Im hosting & performing on SNL this week.— Miley Ray Cyrus (@MileyCyrus) October 3, 2013
So if youd like to meet up and talk lemme know in your next letter. :)— Miley Ray Cyrus (@MileyCyrus) October 3, 2013
Unsurprisingly, Sinead O'Connor wasn't the only one outraged by Miley's comments, as the singer saw a backlash on Twitter....
@MileyCyrus disgusting kick in the teeth to women who have survived mental illness. Not cool or clever.— michellesinhell (@michellesinhell) October 3, 2013
@MileyCyrus Pot,meet Kettle. Instead of acting like the petty, petulant, self absorbed pop star you are, seriously study Sinead's letter.— Lesley Abravanel (@lesleyabravanel) October 3, 2013
Has Miley finally gone too far? Let us know your thoughts people...
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READ SINÉAD O'CONNOR'S OPEN LETTER TO MILEY CYRUS