The remark was one of several made by Victorian Magistrate Vicky Prapas that was found to be inappropriate by the state's judicial watchdog.
Others include asking a court user, "do you reckon the substance is screwing with the way you're thinking" and asserting a participant "believes their own bullshit".
The latter comment was made in the presence of a school group, the Judicial Commission of Victoria said in its findings on Wednesday.
The watchdog opened the investigation following a complaint from Victoria Legal Aid concerning Ms Prapas' rotation through a Melbourne drug court.
The investigation substantiated a range of allegations, including that the magistrate made threatening or intimidating remarks to legal practitioners when they proposed to make or support complaints against her.
Those comments amounted to a "pattern of victimisation", the commission found.
Ms Prapas also made an offensive comment about a person from a marginalised group and made an unprofessional remark about another member of the judiciary.
In the written decision, Ms Prapas acknowleged, among other things, that her conduct in some instances had been "unfiltered and intemperate" and that she would have expressed herself differently with the benefit of hindsight.
But she referred to the unique jurisdiction of a drug court.
In particular that her intention was to promote participant recovery, accountability and community safety within the therapeutic framework of drug court.
She stated that she had reflected carefully on the matters raised and had taken steps to ensure that her communication remains effective, respectful and less susceptible to misunderstanding.
The watchdog was unable to substantiate some allegations, including that the magistrate demonstrated cultural insensitivity.
In handing down its findings, the commission acknowledged drug court proceedings can warrant "open and frank" discussions.
"However, these features do not displace a judicial officer's obligation to afford all court users civility and respect," it said.
The brunt of the complaint was referred to The Honourable Justice Lisa Hannan with recommendations she counsel Ms Prapas.
The watchdog also recommended Ms Prapas familiarise herself with the commission's conduct guidelines and attend an educational event within a year.
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