Charlie Sheen truly has a long list of celebrities that he openly hates aside from Donald Trump.

While on "Watch What Happens Live" on Wednesday, host Andy Cohen asked the ruthless and outspoken Anger Management actor about his feud with Rihanna almost three years ago.

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"Oh, that bitch," Sheen responded as fellow guest Craig T. Robinson shook his head beside him. "No, she abandoned common courtesy and common sense."

"I think you just made it worse," Cohen said.

If you may remember, it all started when Sheen and his then-fianceé Brett Rossi saw the Barbadian pop star at a restaurant. Hours later, he tweeted to explain that he sent a request for Rossi to meet the singer but she refused, claiming that there were too many photographers outside. 

Sheen was obviously not happy about it so he went on a lengthy Twitter tirade and bashed RiRi for not making time for fans like he does.

"Sorry we're not KOOL enough to warrant a blessing from the Princess. (or in this case the Village idiot) you see THIS is the reason that I ALWAYS take the time."  

"See ya on the way down...and actually, it was a pleasure NOT meeting you. Clearly we have NOTHING in common when it comes to respect for those who've gone before you." He added, "I'm guessing you needed those precious 84 seconds to situate that bad wig before you left the restaurant." 

But he wasn't done. He offered more advice to the singer, writing, "Here's a tip from a real vet of this terrain; If ya don't wanna get bothered DONT LEAVE YOUR HOUSE! and if this 'Prison of Fame' is soooooooo unnerving and difficult, then QUIT, junior! c #Hamateur." 

Rihanna responded by simply changing her Twitter banner to a photo of herself autographing a fan's sign with Sheen's cut out head superimposed on the fan's body.

You can watch Sheen's interview on "Watch What Happens Live" HERE.

Tagscharlie Sheen, Rihanna, Celebrity Feuds, Twitter, Andy Cohen, Watch What Happens Live, Interviews