The team didn't wait long to respond.
A man stood up wearing a Brooklyn Nets jacket to ask a question at the session in Queens.
"I'm from Brooklyn too, but this Brooklyn Nets idea has not been working out as it was planned, so I admire you for sticking with them," de Blasio said, according to the New York Post.
Hello, @NYCMayor. From one Brooklynite to another, you should know that we always have each other’s backs. Like all of NYC, we're always grinding to get better. If you want to see some real grit, our doors are always open.— Brooklyn Nets 🇲🇽 (@BrooklynNets) December 6, 2017
"Hello, @NYCMayor," the Nets responded on Twitter. "From one Brooklynite to another, you should know that we always have each other's backs. Like all of NYC, we're always grinding to get better. If you want to see some real grit, our doors are always open."
"The Mayor's a fan and rooting for you guys! We'll find a way to get him to do it in person," a spokesman from the mayor's office tweeted. "#NoBloodNoFoul?"
But this isn't the first time de Blasio has sounded off against a New York team. The Boston Red Sox fan said in October that it would be "impossible" for him to root for the New York Yankees.
"[It's] constitutionally impossible," de Blasio told the New York Daily News.
"The truth is called for in editorial board meetings," de Blasio said. "I am a crazed, rabid baseball fan and Red Sox fan. It is constitutionally impossible to quote unquote root for the New York Yankees."
The Nets (9-14) were 172-238 entering this season since moving to Brooklyn from New Jersey. Brooklyn beat the Atlanta Hawks 110-90 on Friday and host the Oklahoma City Thunder at 10 p.m. Thursday in Mexico City.
De Blasio was born in New York City, but raised in Massachusetts.