Ennis McBride has been founding guilty of stalking and harassing X Factor winner Joe McElderry in a court case in Tyneside.
Judge Roger Elsey told the court that Ennis McBride: "Has given evidence but has not been a compelling witness and lacked credibility.
"He totally lacked insight into the impact of his actions on the complainants."
McElderry was giving evidence at the trial of Ennis McBride, 52, from Stockport, who denies the charge of harassment, The Sun reports.
McBride is accused of turning up at McElderry's house on several occasions and sending him abusive Tweets.
South Tyneside Magistrates’ Court heard that McBride knocked at McElderry's front door on 11 September 2011 while the singer was having a bath.
After a friend who answered told him he was not available, it is alleged that McBride visited the singer's old house and told McElderry’s mother, Eileen Joyce, that her son was a liar.
Joe McElderry told the court: “I was feeling quite shaken and confused, and a bit creeped out.
“My mum sounded very alarmed and distressed and told me to lock the doors.”
McBride allegedly turned up at McElderry's house again on Christmas Eve 2011, and also turned up in the front row of one of McElderry's concerts.
Then on December 24 2011 the court heard that Ms Joyce saw McBride in Asda and later that day he was arrested at their home.
McElderry told the court about the concert incident: “I was really scared and anxious and a bit taken aback."
The trial continues.
Below: Biggest X-Factor winners and losers