[verticalscaler]

It isn't good to argue that way in this part of the world, I hope you didn't raise your voice - not 100% sure about Vietnam but in any of its surrounding countries - they would lose face and become uncooperative.

I learned the hard way after a few experiences like yours to telegraph as little frustration or anger as humanly possible. Reasoning also only goes so far.

But if you appeal on some technicality, even a rule of your own invention..

Carol Beer presents differently across cultures (https://www.youtube.com/watch?v=1pw8m_NTJ_0).