Mickey Rourke Calls Robert De Niro a 'Big F---ing Crybaby' in Threatening Instagram Rant

The two costarred together in the 1987 movie Angel Heart

Mickey Rourke and Robert De Niro. Photo: BG020/Bauer-Griffin/GC Images;

Mickey Rourke is taking jabs at Robert De Niro.

On Friday, the Oscar-nominated star of The Wrestler, 67, posted a heated Instagram rant directed at the Oscar-winning Raging Bull actor, 76. In his post, Rourke called De Niro a "punk a--" and threatened to "embarrass" him if their paths ever cross.

"Hey Robert De Niro, that's right i am talking to you, you big f---ing crybaby," began Rourke. "A friend of mine just recently told me that a few months back you're quoted as saying to newspapers 'Mickey Rourke's a liar he talks all kind of sh--'. Listen Mr.Tough Guy in the movies, you're the 1st person that ever called me a liar and it was in a newspaper."

Rourke, who starred opposite De Niro in the 1987 film Angel Heart, didn't specify which outlet De Niro was quoted as calling him a liar, but proceeded to call him out. He signed the caption "Mickey Rourke 'as God is my witness.'"

"Let me tell you something, you punk a--, when i see you i swear to God on my Grandmother, on my brother and all my dogs,i gonna embarrass you severely 100%," added Rourke.

A rep for De Niro did not immediately respond to PEOPLE's request for comment.

Robert De Niro and Mickey Rourke in Angel Heart (1987). StudioCanal/Shutterstock

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Rourke claimed during an Italian TV appearance in 2019 that De Niro did not get along with him on the set of Angel Heart, a thriller which also starred Lisa Bonet and Charlotte Rampling. According to USA Today, Rourke said about De Niro, "Now, I don't look up to him no more, I look through him."

The actor also accused De Niro of preventing him from being cast in Martin Scorsese's 2019 crime film The Irishman, saying: "Marty Scorsese wanted to meet me for a movie with Al Pacino, Joe Pesci and Robert De Niro. The casting person told my manager that Robert De Niro said he refused to work with me in a movie."

Pesci, 77, and Pacino, 80, ultimately starred in the Netflix movie, which was nominated for 10 Academy Awards.

RELATED VIDEO: Robert De Niro on His Special Relationship with Martin Scorsese: 'I Can't Imagine My Life Without It'

A rep for De Niro told the New York Post in September that Rourke's claim was false, adding that he had never been considered for a part in the movie. The spokesperson mentioned that De Niro was made "aware of these comments" at the time.

"According to The Irishman producers Jane Rosenthal and Emma Tillinger Koskoff and casting director Ellen Lewis, Mickey Rourke was never asked to be in The Irishman nor was he ever even thought of, discussed or considered to be in the movie,'" read the statement.