I do not hang the Singapore flag outside my window. It is not because I don’t like the country as much as others.
For some, having the Singapore flag displayed out is a pride thing. I feel proud of Singapore even without the flag and the flag just doesn’t represent the same thing as my compatriots which could represent a sense of duty, allegiance, sovereignty or whatever.
There’s a lot more to do than just displaying a flag. You could, for example, give up seats for others who needs it more than you. Just do little actions that can result in a more gracious society in your own little way. Be proud of Singapore being the better place you want to be in by making it a little better everyday. Have that represent Singapore and we do need flags.