You're still enjoying the FI part of FIRE. Being financially independent means you can just leave when shit gets intolerable, which in-turn raises your level of tolerance for, well, shit.

Once upon a time, I hit my number,the FI mark. Then I had a kid. As soon as I had the liability of a child, I was no longer truly FI. I felt the walls at work close in again. It has much less to do with the work and the processes and the people. I think it is a sense of control and ability to leave, or lack thereof, that drives emotions at work. I can't walk away anymore and that makes it harder to tolerate the intolerable.