Instead of apologizing for his embarrassing drunken rant, the obnoxious “heir to half of Manhattan” Gerry Shalam has hired a lawyer and is threatening to sue everyone who laughed at him.

Shalam was seen in a viral video leaving a boozy brunch boasting that his dad “owns half of Manhattan,” has considerable influence with Mayor de Blasio and “owns the cops,” while haplessly waving a plastic bag to block the camera shot as his inebriated friend collapses on the sidewalk.

The video was posted on news sites worldwide, with one Aussie outlet even crowning Shalam “New York’s biggest jerk.”

But when we called the 20-year-old NYU student, he didn’t have anything else to say, and hung up immediately.

Then, his attorney Darren Oved said in a sober statement approved by Shalam’s Allenhurst, NJ, family (who don’t own Manhattan), “This is a shameful exploitation of a young man who was clearly protecting himself and his friends from unwanted intrusions into their private lives at a vulnerable moment. Our client takes this blatant violation of his civil rights seriously and intends to take all appropriate measures to ensure that this video’s publishers and all those who have and continue to disseminate it are held legally accountable.”

We’re told Shalam first wants to sue the guy who shot the video and posted it online for breaching his privacy. A lawsuit that will probably have as little legs as his wrecked friend.