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Mayor Bill de Blasio’s critics let him know how they really felt about him ordering New Yorkers to snitch on each other for violating social-distancing rules — by flooding his new tip line with crank complaints including “dick pics” and people flipping the bird, The Post has learned.

Photos of extended middle fingers, the mayor dropping the Staten Island groundhog and news coverage of him going to the gym have all been texted to a special tip line that de Blasio announced Saturday, according to screenshots posted on Twitter.

One user sent the message “We will fight this tyrannical overreach!” to the service and got an automated message that in part said, “Hello, and thank you for texting NYC311.”

“F–k you!” replied @MorganLSchmidt1, along with a meme showing Adolf Hitler and the words “TO THOSE TURNING IN YOUR NEIGHBORS AND LOCAL BUSINESSES — YOU DID THE REICH THING.”

“Start flooding their reporting text numbers with this pics!” the tweet added.

Other profane messages included a photo of a bowl of gummy candies in the shape of male genitalia and a sign saying “EAT A BAG OF D–KS.”

It was not immediately clear whether any of the posters actually lived in New York City.

An NYPD source said that “dick pic” photos of real penises have also been texted to 311, and a caller phoned in a tip that de Blasio was seen performing oral sex on someone “in an alleyway behind a 7-11” early Sunday.

“He looked at me…and coofed in my direction,” the caller said, according to a photo of the 311 operator’s computer screen provided to The Post.

“Coof” is a newly coined term for coughing while infected with the coronavirus, according to the Urban Dictionary website.

The inundation of off-color texts was so large the city had to temporarily shut down the service.

“The city has begun vetting everything before dispersing the information to precincts,” the NYPD source said.