[Oyk]

A Thai retuning to Thailand is expected to speak Thai with the immigration officer at a Thai airport.

If he speaks English, the immigration officer may think he's trying to be funny.

Malaysia's working language is Bahasa Malaysia and all Malaysians are expected to speak it with government officials. It does not matter if the Malaysian is a Tamil, a Han whatever. English is neither Malaysia's national language nor working language.

Same for China right.

We have about 500K Chinese working here. When they return to China, they are expected to speak China's official and working language which is Mandarin with the immigration officer there.

If they speak English the immigration officer will not like it. He will ask, aren't you Chinese? Why are you speaking a foreign language with me?