Boxer Nate Diaz tells Justin Bieber to 'shut your bitch ass up'

Justin Bieber got abuse from a winning boxer after he simply praised the loser but mentioned on Instagram that the winner's boxing style wasn't great.

Bieber praised featherweight boxing champion, Conor McGregor, for his fighting 'finesse' against Nate Diaz.

Diaz beat McGregor at UFC 196 in Las Vegas on March 5. UFC stands for The Ultimate Fighting Championship and is an American mixed martial arts (MMA) promotional company.

UFC started in 1993 as a professional MMA company and has become the world's leading MMA promoter, offering the premier series of MMA sports events that have sold out some of the biggest arenas and stadiums across the world.

Bieber uploaded a photo of McGregor on Instagram with the caption: "Still the champ".

Bieber followed this a video of a toast he made to Mcgregor saying: "To McGregor. He's still the champ. That broke my heart."

To this he added: "No bandwagon but Conor is a true champion, fights with style and finesse, all the respect to Nate but his style is terrible. Nate has a crazy heart respect.'

Diaz retaliated with an image on Instagram showing him slapping Bieber in the face with the caption: "Shut Your Bitch Ass Up.'

He then added another caption: "Bieber's a hater," but the artwork has since been removed.

Thirty-year-old Diaz received $500,000 (£352,349), the biggest win of his 10-year UFC career for his win against McGregor.

Justin Bieber kicks of his Purpose World Tour tonight (March 9) in Seattle, Washington.

Watch the press conference for the McGregor Diaz fight and Justin Bieber in action, below: