Same. I've been extremely lucky that the only layoff I experienced was on first job out of school and on the first day ("we hired too many people").
The worst rejection I experienced was for a consulting position with a Big 4 consulting firm 10+ years ago. I bombed the brain teaser/problem solving question in the last round (IIRC, why are manhole covers round?). I could tell the interview went downhill after that exchange. At the time I had no prior consulting experience therefore I really wanted to pivot into consulting with that opening.
Come to think of it, I have never asked any brain teaser questions like that in any of the interviews I conducted - maybe that's why. :)
>just get practice interviewing and learning how other companies run the process
I did it a few times but never felt the experience is comparable to looking for work "for real".