The former so-called face of Gaelic games at BBC Northern Ireland was accused of being disingenuous, misleading and evasive by an industrial tribunal which rejected his claims of sectarian bias.
Jerome Quinn, 42, was sacked last March for gross misconduct after posting on websites anonymous criticism of the corporation's coverage.
He claimed he saw himself as a "standard-bearer" for the sport and alleged his dismissal was unfair and an act of victimisation because of his race, religion or political opinion.
But in a damning ruling to be released on Wednesday, a tribunal panel chaired by Orla Murray said his claims of discrimination and unfair dismissal should be denied in their entirety.
A report said: "The claimant also gave misleading evidence in the form of statistics in his apparent determination to paint an adverse picture of GAA coverage by BBC Sport Northern Ireland when the actual evidence before us did not support that case."
Mr Quinn's statistics at a tribunal hearing in Belfast compared coverage at a time when football and rugby were in full swing and the GAA not.
The tribunal said at several points Mr Quinn, from Omagh, Co Tyrone, was evasive when being questioned on points which were not supportive of his case. In contrast he gave very precise evidence on points which he felt were supportive of his case.
'Disingenuous'
The tribunal said: "We assessed the claimant to have been disingenuous at various points in his evidence."
Mr Quinn was suspended in February last year after his criticism of the BBC's GAA coverage was discovered by an internal investigation. He had been with the BBC in Belfast for 17 years.
The tribunal found that he was fairly dismissed for gross misconduct.
One of Mr Quinn`s complaints surrounded BBC coverage of GAA matches.
However airtime for soccer and rugby had decreased according to the tribunal, while that of the GAA has increased substantially in line with the winning or losing of broadcast rights for those sports, and depending on how successful the teams were.
The percentage spend on the GAA was also higher than rugby or domestic soccer, the tribunal said.
Many of Mr Quinn`s allegations surrounded the conduct of BBC sports editor Shane Glynn who was accused of not commissioning him for sports documentaries. He alleged as well that he tried to ensure a GAA player was not nominated for Sports Personality of the Year.
However the tribunal said Mr Glynn had been an impressive witness.
"He was consistent in his evidence and in the contemporaneous documents which we were referred to as a considerate, reasonable manager attempting to balance the competing demands of his staff, the different sports audiences in Northern Ireland, the business needs of the organisation and budgetary constraints," it said.
Mr Glynn is a Protestant with a mixed-religion background from Co Cork in the Irish Republic.
Mr Quinn said the editor had consciously and deliberately targeted him for adverse treatment because he was an Irish Catholic and connected to the GAA.
The tribunal said: "We did not accept this as it was not borne out by the evidence, especially where Mr Glynn promoted and engaged Irish Catholics in his department and encouraged the claimant and sought other avenues for him to develop his career.
"Mr Glynn clearly respected and promoted GAA coverage and actively negotiated increased coverage.
"The claimant has therefore failed to provide facts from which we could conclude that Mr Glynn`s treatment of him was tainted by unlawful discrimination."
He also complained about BBC sports presenter Jackie Fullerton's involvement in a panel to judge Sports Personality of the Year, alleging that Mr Fullerton said a GAA player should not win.
"The claimant's allegation about the Sports Personality of the Year process in 2008 in our view illustrates the claimant's extreme sensitivity to any perceived threat to anything relating to GAA and also illustrates his capacity to jump to conclusions about the motives of his manager and to ascribe adverse motives to him when he was seeking to exercise a legitimate management function," the tribunal added.
"We do not accept that there was a plot to ensure that a GAA person did not win."
He was questioned about his use of the expression "the north" to refer to the Northern Ireland soccer team but claimed he had no idea this could offend a section of the community.
In October 2008 his presentation of sports coverage on BBC Radio Ulster's morning news programme relegated a Northern Ireland international soccer report behind GAA stories including the appointment of a new manager to the Limerick hurling team.
He was dropped as presenter of the BBC's flagship The Championship coverage.
The tribunal ruled: "This is a case where the claimant felt that The Championship programme was his domain and that he was the face of the GAA on BBC television.
"We accept that the claimant was moved for valid reasons completely unconnected to the fact that he was an Irish Catholic."
It said it was unfair to compare his treatment to that of Stephen Watson, who was employed as a presenter and said there could be no comparison with former radio DJ George Jones who was also dismissed by the BBC.
It added: "On the evidence before us it was only the claimant who felt that he was targeted, sidelined and disadvantaged."
Mr Quinn said: "Justice has yet to take its course and I have been advised not to say anything more at this point."
A BBC spokesman said: "We can confirm that we have received the decision of the tribunal. However, it would not be appropriate for us to comment on that outcome until the findings have officially been made public by the tribunal."
© Press Association