A Manhattan judge extended an injunction yesterday that barred a posh eatery from opening up in Union Square Park and selling $18 brunches.

And as he 86ed the tony Chef Driven Market, Manhattan Supreme Court Justice Arthur Engoron ranted against the pricey eating habits of city foodies.

“As we navigate the wake of . . . Occupy movements and ‘99 percent against 1 percent’ class warfare, we would seem to be in an era of retrenchment and austerity, not conspicuous consumption and luxury,” he wrote in the decision, released yesterday.

Geoffrey Croft, of NYC Park Advocates, saluted Engoron’s comments. “It was a very thoughtful decision,” Croft said.

Chef Driven Market was to open in April 2013 with a menu including $34 entrees along with its high-priced brunch items, according to the decision. The city plans to appeal.