A Manhattan man was all smiles Sunday as he was freed without bail after he allegedly assaulted his own granny — leaving his grandparents scared and outraged that he’s back on the streets.

Johnathan Cloutier, 22, grinned broadly as he headed out of Manhattan Criminal Court.

Cloutier — who had earlier bumped fists with an accused drunk driver after learning neither would be locked up — then flashed a “Peace Out” sign in the hallway and tried to bum a smoke from a court officer as he left.

His freedom came despite a prosecutor’s allegation that Cloutier shoved his grandma so hard that she “went to the hospital for severe bruising and a lot of pain.”

Grandmother Gretchen Cartagena, 66, told The Post that Cloutier injured her early Thursday after she complained that he and several friends were making too much noise while getting high on a cough-syrup concoction known variously as “Lean,” “Purple Drank” or “Sizzurp.”

When Cloutier refused to leave the family’s Harlem apartment, he and his grandfather, Rafael Rodriguez, 65, got into a shoving match and Cartagena stepped between them to try and stop it, they both said.

Cloutier then pushed Cartagena, smashing her into a wall and leaving her crumpled on the floor, they allege.

When Cartagena was unable to get up, Rodriguez called an ambulance as Cloutier and his pals cleared out, they said.

Cartagena called Cloutier a “brute” who “gets very violent, enraged and aggressive” when he’s intoxicated.

“People like Johnathan are dangerous and should not be outside,” she said.

Cartagena filed a complaint against Cloutier on Friday, and he was busted while allegedly riding a stolen e-bike on the sidewalk in front of 467 W. 125th St. shortly after 1 a.m. Saturday, the NYPD said.

In addition to two counts of felony assault — including for intentionally injuring a person 65 or older — Cloutier was charged with criminal possession of stolen property and possession of an illegal switchblade, authorities said.

Cloutier’s charges aren’t covered by the controversial bail-reform law that went into effect Jan. 1 and mandates the release of most suspects charged with misdemeanors or non-violent felonies.

Instead, the Manhattan District Attorney’s Office simply didn’t seek to have Cloutier held on bail, and state Supreme Court Justice Felicia Mennin cut him loose on supervised release pending a Feb. 4 court hearing.

As a condition of getting sprung, Cloutier was ordered to stay away from his grandparents and move out of their Harlem apartment.

He returned late Sunday morning to pick up his belongings, but Cartagena refused to open the door and told him to come back with a cop, she said.

“I don’t feel safe here with him being out,” Rodriguez told The Post.

“That guy is dangerous.”

In 2018, Mennin, an appointee of former Mayor Mike Bloomberg, came under fire for sentencing rapper Tekashi 6ix9ine to 1,000 hours of community service and probation for posting an online video of a 13-year-old girl engaging in a sex act.

On Sunday, the judge also granted supervised release to another defendant charged with attacking an elderly relative.

Estella Pando, 52, is charged with second-degree assault for allegedly punching her 82-year-old mom inside their Washington Heights apartment around 9 p.m. on Friday.

No one answered the door there Sunday evening.

In addition to noting that Mennin’s rulings came at the request of prosecutors, a spokesman for the state Office of Court Administration said that she imposed the “highest level of supervised release possible,” which includes a requirement to report in person, once a week.

“Mr. Cloutier is a 22-year-old young man with no criminal record. The DA, knowing all the facts and circumstances of the cases, agreed to supervised release. It is clear everyone agrees that our client should not be incarcerated at Rikers Island,” said a spokesperson for the Legal Aid Society, which is representing both defendants.

The Manhattan DA’s Office didn’t return a request for comment.

Additional reporting by Rebecca Rosenberg and Bruce Golding