Barry McGuigan has called on the "appalling" Tyson Fury to "grow up" after receiving online abuse from Britain's world heavyweight champion.
Controversial WBA, IBF and WBO heavyweight champion Fury branded McGuigan a "traitor" on Twitter in response to criticism from the former featherweight champion.
Fury has been widely criticised after making homophobic, sexist and anti-Semitic comments in a YouTube broadcast, with promoter McGuigan describing the 27-year-old "like a child (who) has no filter, no off button" in a column for the Daily Mirror.
Fury labelled McGuigan "a traitor to your home country" in response on Twitter, leading the Northern Irishman to offer a further riposte.
"Tyson is appalling and comes out with some appalling stuff," McGuigan said.
"He was unnecessarily abusive towards me and my past and he can't behave like that.
"Grow up Tyson and catch a grip of yourself."
Fury is due to meet Wladimir Klitschko in a world-title rematch in Manchester in July - and while it is uncertain if he will face any sanction following his latest rant, plenty of people have called for him to be banned.
The Campaign Against Antisemitism has already complained to the British Boxing Board of Control (BBBofC), who has previously warned Fury about his conduct and who earlier this year met to discuss divisive comments he made in the wake of his world-title win over Klitschko.
Fury made an attempt to clarify his comments, with a series of tweets:
McGuigan wrote in his Daily Mirror column that he felt "lucky" for having tried and failed to sign Fury.
Following the 27-year-old's ill-advised swipe at McGuigan, the promoter quickly received a number of social media posts in his defence, referencing the widely accepted view he helped bring a degree of unity to Northern Ireland through his sporting exploits in the 1980s...