Spoiled brats will always be spoiled brats, parenting is at fault! Though i have met a great deal of Singaporeans with good manners too, so it's really a matter of parenting I believe.
Balance is very important, I get so annoyed when my own daughter slouches around, or sits at a table doing the same, they need to be reminded all the time until it sinks in, how to eat correctly, how to be well mannered, and how to respect others, it doesn't help by ignoring the issues which most parents do here!
My daughter said to me one day, that her friends thought i was really strict, because i give her a good talking to, in front of them. Strict is the wrong word i said, tell them I'm very disciplined, with a harsh voice