Ben Simmons says things got so nasty between him and the 76ers ... that at the height of their tension, it felt like everyone in the org. was "just trying to f*** with me now."

Simmons finally opened up about his breakup with Philly on JJ Redick's "The Old Man and the Three" podcast ... and he said during the worst part of their relationship back in Oct. 2021, he thought multiple high-ranking people in the franchise, including head coach Doc Rivers, were out to get him.

"I actually spoke to Doc before practice," Simmons said when recalling the infamous fall workout that he was booted from and later suspended over. "I was like, 'Doc, I'm not ready. Mentally, I'm not ready. Please, just understand that.'"

"I tried to let him know prior," Simmons continued. "He was like, 'Well, I'm going to put you in any way.'"

Simmons said early on in the practice, Rivers put him on the floor. Predictably, Simmons didn't handle it well, and Rivers kicked him out. The Sixers later banned him 1 game for it all.