Coiuntries are sovereign. Foreigners don't decide, that's a key outcome of the thirty years' war. So if you go to X, the polite, proper, non-imperialist thing is to follow accepted custom.

Of course, that raises the question of what "accepted custom" means. It's not clear to me that bribing is really accepted in the countries where it's a custom, widely accepted, rather than being something people do reluctantly.

For example: Will you use oil from Saudi Arabia for your business? You could refrain because so much of the payment gets sidetracked to those 4000 princes, or because refraining brakes the climate changes a little bit, or even both.

The list goes on. There's much that's bad in the world.

Deciding to be principled about bribes and morally flexible about the rest seems… okay to me. Not particularly bad.