Outrageous: Workers at PS 200 warned their superiors and union about a colleague’s creepy behavior, his open confession of suffering from mental illness and his social media display of his shirtless chest bizarrely tattooed “Allah,” “Muhammad,” “Donald J. Trump,” “The Antichrist” and “Death” — only to be told, “Stop being racist.”

Oh, and “Stop looking at Instagram,” as if their nosiness were the problem.

In all, Sayed Mohassib was the subject of at least 10 behavioral complaints from colleagues frightened by his “blank stares” and his proclivity for showing students his necklace’s gun charm.

Of course they couldn’t know he’d wind up an accused killer, but they were right to worry.

And it’s despicable that the race card could shut them up, meaning DEI-think still rules the public schools.

Who was protecting him?

The outrage isn’t just that supervisors and union reps squelched the complainers, or that vetting of student-facing employees that the Department of Education insists is “robust” failed so obviously here, missing a forest of red flags.

Mohassib was booted from the NYPD and the Marines for psychiatric causes and involuntarily hospitalized at least twice; he threatened family violence and believed he was the target of imaginary villains — yet still got a New York State Teaching Assistant Certificate.

How many other lunatics make it through?

One worse outrage is that people who likely knew of all the danger signs may have helped him get the job in the first place.

Post sources say his sister is also a PS 200 paraprofessional, while the siblings’ aunt is an assistant principal at another city school.

We so far haven’t heard what got the United Federation of Teachers to ignore a danger to its members.

Shame on the UFT, shame on the DOE, shame on the principal of PS 200.

Mayor Zohran Mamdani promises a full review — he must hold to it.

This is a story that should terrify every parent in the city.

New Yorkers demand answers.