A Wall Street broker posted more than 500 nasty comments across social media about the contractor who renovated his Upper West Side apartment, according to a lawsuit.

David Waldman, vice president of the GFI Group, spent four months defaming Sean Robinson as a liar and a fraud on Facebook, Twitter and Yelp, according to Manhattan Supreme Court papers.

One of Waldman’s alleged Yelp reviews of Robinson’s business, Eclectic Builders, described his workers as “unprofessional lazy hacks.”

“He’s made it his mission to torment my client,” said Robinson’s lawyer, Daniel Szalkiewicz.

Robinson, who said he did a good job renovating the $1.8 million West 66th Street flat, is seeking unspecified damages from Waldman, who did not return messages seeking comment.