I had a bad vibe with a Manager in Switzerland who is well-known and respected in the industry that I work in - but we fell out.

Though he moved abroad, that wasn't the end of it - he actively went against me and stopped me from getting work in Switzerland. For a while. I work in a niche market and have got the better of him now. The prick.

Overall, I guess it's best to not upset people wherever you are if they are in senior positions. Best to keep your mouth shut. But I know people in different industries that get away with it. Just.

I wouldn't recommend it - Switzerland is a very small country. Everybody knows everybody. For whatever reason - if you upset someone higher up the chain - they can turn upon you and silently respond:

"you will never work in this town again"

Beware!