Jason Woolstencroft, 39, of Williams Road, represented himself in the Warrnambool Magistrates Court on Monday and offered a defence of his actions before agreeing to plead guilty.

The court heard that on June 3 Woolstencroft attended the psychiatric department of the Warrnambool Base Hospital for his regular monthly injection.

The police prosecutor said a small altercation began after Woolstencroft began arguing about how he would get home.

The court heard that Woolstencroft then struck one of the treating doctors, hitting him in the arm. Woolstencroft was placed in a room to calm down for about 20 minutes but upon being let out of the room he approached the doctor for a second time and struck the doctor in the chin.

Woolstencroft then grabbed the doctor from behind and held him until staff intervened.

The court heard the doctor was shaken but not injured.

In his police interview Woolstencroft denied hitting anyone.

Woolstencroft claimed the incident stemmed from his desire to have a vasectomy reversal, that he had been "sexually entrapped", that he would be deprived justice because he earns less than a doctor, that forensic evidence proved his innocence, and that he had been declared "sane" and was "simply eccentric".

He also told the court he understood hospitals had a zero tolerance for violence.

Woolstencroft concluded his court appearance by saying it was his basic human right to be able to reproduce and told Magistrate John Lesser "you don't have ovaries, get over yourself - by the way that was a joke, your honour, so don't get grumpy".

Mr Lesser, who had to repeatedly tell Woolstencroft to be quiet during the hearing, found Woolstencroft guilty of assaulting a registered health practitioner and fined him $250.