The Brooklyn Nets guard came under fire last month after reposting a 2002 clip of the "InfoWars" host ranting about a New World Order that would release plagues into society for financial gain ... which featured the caption "Alex Jones Tried To Warn Us."

Irving's Jones endorsement came weeks after the talking head apologized in court for claiming the Sandy Hook shooting was a hoax ... so the timing was a bit odd to say the least.

Now, KAJ is weighing in on Irving's actions ... saying if it weren't for young basketball fans, he'd be "dismissed as a comical buffoon."

"Alex Jones is one of the most despicable human beings alive and to associate with him means you share his stench," the Lakers legend said on his website.

"When I look at some of the athletes who have used their status to actually improve society-- Colin Kaepernick, LeBron James, Muhammad Ali, Bill Russell, Billie Jean King, Arthur Ashe, and more -- it becomes clear how much Irving has tarnished the reputations of all athletes who strive to be seen as more than dumb jocks."

Abdul-Jabbar says people shouldn't just scoff at Irving -- there should be action -- and he wants those outraged to write to the All-Star's sponsors to demand they cut ties with him.

"Irving does not seem to have the capacity to change, but we have the capacity to keep fighting against his brand of destructive behavior."

FYI -- Irving's deal with Nike is most likely up after this season, but KAJ points out he still has deals with Pepsi and 2K Sports.