The outspoken X Factor judge continued: "It's like, pissing in a bucket. It's like, 'Oh, we're the bad boys!' F**k off! You don't know what bad is. And I think that he's lost, I really do. I think he doesn't realise he's white and not black - that's a huge problem.
"And, at the point he's at in his career, it's so dangerous because we've seen it all before a million times. Where do you go when you're a child entertainer and then you want to transition to be a man? Very few make it."
We take a look at some other stars who have been the subject of Osbourne's famous tirades - from Lady Gaga to Susan Boyle - below.
Osbourne was even more scathing about Kanye West during her recent interview with The Daily Beast, complaining: "I have no time for him. He bores me. He's an average-looking man with an average talent, but he's a great salesman.
"He should sell cars because they would f**kin' fly out the door. He's his number one fan."
Sharon Osbourne arguably went too far when she described Britain's Got Talent finalist Susan Boyle as a "hairy arsehole."
Speaking to Sirius XM Radio about Boyle's success, Osbourne commented: "I like everybody to do well. Even somebody that looks like a slapped arse. God bless her. It's like, 'You go girl'. She does look like a hairy arsehole."
She added:"[God] gave her the talent. Yes he did. [And] he hit her with a f**king ugly stick."
She later issued an apology to Boyle.
Unknown US journalist
Sharon Osbourne admitted that she used to send turds in a Tiffany box to enemies, including an American journalist who insulted her children, Kelly and Jack. Along with the box, the star also sent a note which read: "I heard you've got an eating disorder. Eat this."
She later revealed to The Guardian that it was indeed her own faeces.
Speaking about US chef Martha Stewart, Osbourne said on reality TV show The Osbournes: "Martha Stewart can lick my scrotum! Do I have a scrotum?"
Osbourne famously feuded with fellow former X Factor judge Dannii Minogue in 2007. Osbourne revealed she fell out with Minogue on day one, comparing her to "a mosquito you want to flick away".
She later told Piers Morgan during an interview on ITV that she left the reality TV show because of Minogue, adding that the Aussie actress and singer was only on the panel because she wanted to "f***k Simon Cowell".
Osbourne also described Minogue's plastic surgery as "appalling".
She more recently added that Minogue is "insignificant".
While judging on the X Factor spin-off show Battle of The Stars, Sharon Osbourne let rip at the alleged former flame of David Beckham Rebecca Loos.
Osbourne told Loos, who was competing on the series: "You should try doing tomorrow's performance with your knickers on because it will help warm up your voice. You have a very bad vibe that comes from you."
Sharon Osbourne branded Lady Gaga "hypocritical" after the singer responded with an open letter about Kelly Osbourne's criticism of her fans.
Osbourne wrote: "You say 'a kinder, braver world'. I don't know what world you live in, but supporting disgraceful fan comments doesn't fall under the words 'kinder and braver'. It comes under the heading of bulls**t."
Sharon Osbourne turned her venom on Chris Tarrant when she spotted the TV presenter in the crowd during an X Factor live show.
Chris had previously said that Ozzy Osbourne was "inarticulate", to which Osbourne responded: "Don't you dare diss my f**king family. How dare you say those f**king things - at least I'm in a f**king marriage!"
Chris had been through a divorce from Ingrid Tarrant following claims of his infidelity.
Sharon Osbourne lost her rag with comedian Vic Reeves when she and her family presented The Brit Awards in 2008. Reeves was attempting to present 'Best British Album' before making jokes about Kylie Minogue, to which Osbourne interrupted to squawk: "Shut up, you're pissed. Piss off you b**tard."
Sharon Osbourne described 2004 X Factor winner Steve Brookstein as a "ball-less b**tard" during the show's recent press conference.
She also criticised Brookstein in an interview during the 2004 finals, adding: "He's arrogant, boring and he can't dance. I think Steve will have one massive hit single then disappear. He'll be back to end of the pier work in no time - serving chicken in a basket with extra sauce."
And of course, who can forget the moment when Osbourne threw an entire glass of water in poor Louis Walsh's face during a disagreement about one of Osbourne's acts, before Walsh asked if she was "taking Ozzy's drugs".