It's funny, in Singapore people don't normally talke to
strangers - much less smile at one another. But I note, that in an
accident or in a calamity of sorts, strangers will talk to each
other like long time friends!
I just feel that people here are friendly, but are always with a
'front', some face mask, on guard all the time. Perhaps it comes
from too much work as in office politics makes people put on a
facade - hiding their true feelings or character.
Generally, I think UPTIGHT is the word to use in describing people
here.