Michael Conlan has crashed out of the quarter finals of the Olympic boxing as judges in Rio unanimously awarded victory to Vladimir Nikitin of Russia.
The 24-year-old, who has held European, Commonwealth and World titles in his sport, looked throughout the match to be winning comfortably.
Speaking to RTE Sport, the bantamweight boxer from Belfast said "amateur boxing stinks from the core to the top" and vowed never to fight in an AIBA fight again.
"I thought I boxed the ears off him in the first round and they scored against me. It's a shambles... Today showed just how corrupt this organisation is."
In the rant laden with curse words, Conlan accused his opponent of cheating, saying: "They're known for being cheats and they'll always be cheats."
Twitter was also on his side, supporting the boxer's decision to speak out in the post-match interview.
Conlan's defeat, as well as Katie Taylor's loss yesterday, means the Irish will return home with no boxing medals for the first time in 12 years.