Charlie Sheen is at it again: the actor posted a late-night racist tweet about Barack Obama on Thursday, referring to the president as “Barry Satera Kenya” – just the latest rant in the actor’s downward spiral.

Sheen, who suffered an infamous meltdown in 2011 that led to his firing from Two and a Half Men, was apparently upset that the president filled out a bracket for the NCAA basketball tournament, which Obama does – rather publicly – every year. “Barry Satera Kenya u won’t attend a soldier’s funeral uhkros da street that u kild yet u hav time 4 brackets? s a d,” Sheen wrote in a rambling message on Twitter.

Barry Satera Kenya u won't attend a soldier's funeral uhkros da street that u kild yet u hav time 4 brackets? s a d c http://t.co/KM1in5MPio — Charlie Sheen (@charliesheen) March 19, 2015

Obama has an annual tradition of participating in March Madness, an issue that has irked conservatives who also routinely criticize the president for playing golf – also rather publicly.

Sheen’s anger over the soldier’s funeral appears to be a reference to Major General Harold Greene, a two-star general killed in Afghanistan. The US rightwing media has repeatedly claimed that the Obama administration ignored Greene’s funeral when, in fact, defense secretary Chuck Hagel was in attendance.

A faction of rightwingers has also questioned Obama’s birthplace dating back to his candidacy in 2008, suggesting that he was born in Kenya and demanding the release of Obama’s birth certificate. Obama’s father was from Kenya, but the president was born in Hawaii. The significance of “Satera” remains something of a mystery.

Sheen has a history of going public with his conspiracy theories: the former Anger Management star once said he wanted to meet Obama to investigate a potential 9/11 cover-up. He also criticized the president’s push for gun control after the Sandy Hook school massacre in Newtown, Connecticut.

Sheen’s rant coincides with revelations about the antics that led him to be fired from his top-rated sitcom, which recently concluded its run on CBS. In an upcoming book, Sheen’s Two and a Half Men co-star, Jon Cryer, discusses how Sheen booked him a prostitute after his divorce as well as his drug use and tantrums on set.