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I would see having common sense as the ability to take in your surroundings and the people of the situation you find yourself in and being able to come to the decision that is best appropriate.
So take your example for instance, if I was in an area that had a communal toilet that wasn't flushed after each use it would be socially unacceptable to flush it after your use, it could also be seen as an insult or ignorance to your surroundings for not taking the way things are done there into account.
And vice versa if I was from an area that did that and travelled to an area that had a full sewage system then I would utilize it. If your travelling to an area unknown to you or venturing into a culture that is different to your own it would be considered common sense to make yourself aware of socially unacceptable behaviour so that you would not insult or cause any issue out of ignorance. |