"I'm making it official, I'm no longer a Knicks fan!!!"
That's Michael Rappaport officially ENDING his NY Knicks fandom -- saying he's "disgusted" with the team for firing head coach David Fizdale and can no longer justify rooting for 'em.
"I'm serious. I am a fan of the past Knicks. I'm not rooting for this team."
Rap says the only way to send a message to Knicks management is through a celebrity boycott -- and he's calling out the stars by name!!!
"Jerry Seinfeld Howard Stern, Chris Rock, Tracy Morgan, all the cast of SNL ... I know you get to go to the Garden Suite and get the free meals and the shrimp cocktails and the cookies ... DON'T GO TO GAMES ANYMORE!"
"Taylor Swift, Ariana Grande ... don't do it! Go to see 'Cats' on Broadway. Go to see 'Book of Mormon' ... Netflix and chill."
In fact, Rap -- who stars in "Atypical" -- is out on his U.S. comedy tour ... which should help him take his mind off the Knicks but you gotta watch the clip. He's PISSED!!!
In fact, he also goes crazy on Knicks owner James Dolan and delivers a personalized message to the billionaire.