Literally everywhere? I don't think I've worked in a work environment to date where at least half of anyone in a management position was not a complete BSer. It honestly made me wonder if that's what it takes to move up.
Clearly not if only half of management are bullshitters. It's also not exclusive to management: I've met plenty of rank-and-file developers who specialize in talking shite.
The difference is that if you're an IC you generally have to produce actual work that will be evaluated at some point. It's of course possible to BS your way into showing your manager you did more than you actually did or better than what you actually produced. If you're in management, then your job becomes mostly talking/meetings, which is much more conducive to "hand waving," which is probably why there are so many BSers who end up thriving in those roles.
Bullshitters are good at presenting the work they're doing as very challenging even when it's trivial, so they can also just ride simple a task for a long time.
I have been thinking about that too. I go to work to do interesting technical stuff and deal with political stuff only as necessary. That's what motivates me. But I think it would be much better to go there for the purpose of self-advancement and only do stuff that serves that purpose.