Instead of a stereotypical Father's Day Instagram post for his father, Pax Jolie-Pitt allegedly decided to take a different approach.

The adopted son of Angelina Jolie and Brad Pitt reportedly took to the social media platform and did not hold back in 2020. On his Instagram Story at the time, the now 19-year-old is said to have posted a photo of Brad receiving an Oscar for his role in Once Upon A Time...In Hollywood.

Around the photo, Pax is said to have posted a lengthy rant dedicated towards the Fight Club actor. "Happy Father's Day to this world class a*****e!! You time and time and again prove yourself to be a terrible and despicable person," the post apparently read.

Angelina Jolie and kids
Pax is one of the many children Angelina and Brad share

"You have no consideration or empathy toward your four youngest children who tremble in fear when in your presence. You will never understand the damage you have done to my family because you are incapable of doing so," it continued, according to snaps obtained by Daily Mail.

Pax allegedly finished the scathing note with: "You have made the lives of those closest to me a constant hell. You may tell yourself and the world whatever you want, but the truth will come to light someday. So, Happy Father's Day, you f*****g awful human being!!!"

Angelina Jolie adopted Pax from an orphanage in Ho Chi Minh City, Vietnam in 2007 when he was three years old. His biological mother was addicted to heroin and left Pax in the orphanage when he was a newborn. A year later, Brad formally adopted Pax.

Angelina Jolie and Pax Thien Jolie-Pitt
Angelina adopted Pax from Vietnam
Angelina Jolie and Pax Jolie-Pitt
Pax reportedly said Brad 'made the lives of those closest to me a constant hell'

The four youngest children who "tremble in fear" that Pax referenced would be the youngest of the Jolie-Pitt bunch - Zahara, 18, Shiloh, 17, and twins Knox and Vivienne, 15. The last three are Brad and Angelina's biological children while Zahara was adopted by Angelina in 2005 from Awasa, Ethiopia.

Zahara seems to hold anger against Brad as well. During a luncheon on Spelman College's Atlanta campus, she joined Alpha Kappa Alpha Sorority and dropped the Pitt from her last name. Angelina, Pax, and Maddox - the oldest of the adopted children - went to Atlanta, Georgia to celebrate.

Her father was noticeably not there. Brad is reportedly dating a 26-year-old jewellery designer, Ines de Ramon. Angelina and Brad have been separated since 2016 and officially finalised in 2019.

Brad was also investigated by the FBI and the Los Angeles Department of Children and Family Services over allegations that a fight had 'escalated' when Maddox stood up for his mother when Brad was reportedly drunk and yelling at her. Brad was cleared of all charges.