I think he is still salty about not getting paid well.
He got screwed in a deal with the bulls.
Other than that, he seems to be very jealous of Mike. Also, the fact Pippen was nothing more than just a teammate and training partner to Mike doesn’t help either. I think he wanted to be accepted as his friend. But it never happened. He feels that he was used.
Then there is The Last Dance documentary.
https://www.basketballnetwork.net/old-school/pippen-was-upset-with-jordan-for-including-his-infamous-moment-in-the-last-danceSo he also feels betrayed.
Furthermore, Mike’s son was porking Pippen’s ex wife.
It’s a lot of shit that has affected him over the years and the dude kept it inside. And saying a bunch of shit that make no sense is him having an outburst. All that emotion clouded his mind.
He should get a therapist to help him deal with his emotions.
And also concentrate more on what can make him happy rather than let a bunch of people live rent free in his head.