Tim Griffiths,who is also a published author,took national law firm HWL Ebsworth to court after his employment was terminated.
Less than 1 per cent of unfair dismissal applications brought before the Fair Work Commission in the first three months of the year were successful.
The commission agreed that Mr Perry had not called a colleague a"bitch"as the machinist had claimed in a bid to minimise his own threat to slap a co-worker.
The workers were told they would be fired for having a relationship with each other.
A worker was allegedly threatened with the sack after asking for compassionate leave to attend his father-in-law's funeral.