Over here in the USA, I don't think any customer service worker expects to be able to openly mock a customer and still have a job. I struggle to imagine the idea of calling my boss a wanker to his face and still expecting to have a job. To insult the CEO seems like it might as well be a resignation - if you have that little respect for leadership, why are you working at that company?
What an astoundingly dumb question. Most people work somewhere to get paid, and If you think its unusual to hate the boss, oh boy, do I have news for you!
It's funny that such a cognitive dissonance between freedoms and rights vs the absolutist tyranny of corporate life making a mockery of those freedoms can coexist in the same society with the same staying power.
I just think it's stranger for the USA's work culture to be so deferential to leadership while its societal values are outwardly quite loud about freedoms, it's more understandable to me for East Asia to be that way. For the USA case it's probably a mixture of the servitude/slavery past with still being quite religious compared to other Western peers.