A John Jay College economics professor suspended from his job for tweeting that “it’s a privilege to teach future dead cops” on Saturday slammed Mayor de Blasio as anti-police.

Self-described “antifa” activist Michael Isaacson sparked controversy Friday when his Aug. 23 tweet about “dead cops” came to light, prompting threats to his John Jay faculty colleagues and criticism from police unions and city officials.

It’s Hizzoner who has a problem with cops, Isaacson, 29, tweeted on Saturday morning in response to de Blasio’s call that he be fired.

“[H]e messed up big,” Isaacson wrote of de Blasio at 8:23 am., retweeting the mayor’s Friday tweet about the controversy.

“First @NYCMayor has taken a swipe at the administrative autonomy of John Jay College and CUNY,” he wrote in a series of messages. “Second, @nycmayor has taken a swipe at free speech and academic freedom. Third, @NYCMayor is placating PBA with a costless symbolic demand to avoid having to meet the MATERIAL demands in contract negotiations. Keep in mind this is the same @NYCMayor who was protested by that same PBA for balking on a 1% pay increase. Who’s really anti-police here?”

The mayor wrote on Twitter that “New York City won’t stand for the vile anti-police rhetoric of Michael Isaacson and neither should John Jay College.”

John Jay President Karol Mason had called Isaacson’s views “abhorrent.”

“ I am appalled that anyone associated with John Jay, with our proud history of supporting law enforcement authorities, would suggest that violence against police is ever acceptable,” she said Friday.

“Some of ya’ll might think it sucks being an anti-fascist teaching at John Jay College but I think it’s a privilege to teach future dead cops,” Isaacson tweeted on Aug. 23.