A Colin Kaepernick hater heckled the former NFL star on his way out of Madison Square Garden on Wednesday -- calling the ex-QB a "bum" and saying, "You could never throw a football."
The jerk was heard loud and clear as Kaepernick left the Knicks game in New York and got into his ride ... with the man yelling twice, "You're a bum."
"Get in that car," the heckler added.
Kaepernick never acknowledged the man ... and quietly walked through a swarm of people on his way out of the NBA game and into the waiting car.
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Inside of the arena, Colin clearly had a much better time -- he sat next to Spike Lee, and was also spotted chatting it up with former MLB star CC Sabathia before tip-off.
During the game, ESPN Films announced a new docuseries was in the works about Kaepernick, with the production company saying Lee had been tapped to direct it. Officials promised it would tell Kaepernick's story in a way that's never been heard before.
Kaepernick, meanwhile, has said he still wants to play in the NFL again someday ... despite being out of the league since the 2016 season.