[agumonkey]

Culture shock / Calibration. Similar to Russian approach on social politeness. Or the lack there of. They don't smile unless they have a real reason to be happy. For westerners they appears cold hearted.

Autistic persons are a bit like that too. They have a very simple optimization scheme, so pointing at suboptimal things directly is seen as a gift when most people will have a broad view on being told, shame, disrespect etc etc.