Stephen Jackson Says Ja Morant Flashing Gun On Instagram A 'Moron Move'

Stephen Jackson defended Ja Morant when he flashed a gun on IG Live in March ... but the former hooper says he can't have the back of the Grizzlies superstar this time around,  calling the act "the dumbest thing he could've done."

"It's not what you do, it's what you do after. And, what you do after is not do the same thing again, like what [Ja] just did," 45-year-old Jackson said on I Am Athlete's Paper Route show.

"All the people like me that was taking up for him, that's said 'it was a mistake, he's a young kid.' We can't go to bat for him this time. This is the dumbest thing he could've done. This is a moron move."

Of course, 23-year-old Morant was suspended by the Grizzlies over the weekend after another video surfaced, showing the 2x NBA All-Star holding a handgun while in a car with his buddy.

The video comes just two months after Ja was seen holding a pistol on Instagram Live while in a Denver area strip club on March 4. Morant was suspended 8 games ... and decided to seek treatment, entering a counseling program in Florida, where he stayed for a few days.

In a sitdown interview with Jalen Rose, Ja vowed to make better decisions going forward ... though Jackson always doubted the effectiveness of the treatment Morant received in the Sunshine State.

"It's just a f**ked up situation, but you gotta really just put everything in his lap and let him deal with it. He gotta deal with everything that comes with it because he done the same dumb thing again that he act like he went and got help for," Stak said.

He continued ... "Just like I told yall, he didn't talk to nobody and get help that fast. There was no way. That was a publicity stunt. This is all on him and can't nobody defend him. I definitely won't stand up and defend him because that was the dumbest thing you could've done."

Jackson, who played 14 seasons in the NBA, says he had Ja's back before the first incident because he was once in a similar situation to Morant ... but Stephen says he learned and made changes where necessary.

"I was one guy that actually went to bat for him because I've been a guy who was thrown a lot of money at a young age and made a mistake, but I'm totally different than the person I was. A lot of people commend me on the changes I made after the mistakes I made."