Interesting question. Not sure I agree with the premise, in that certainly where I live, I don't think there is a clear objective line of acceptable noise dictated by 'social norms'. I'd say that the social expectation should and does include reference to others' preferences and your own situation.

So if someone has a reason to dislike noise, you make more effort to avoid noise. But on the other hand, you're more tolerant of noise if, e.g. someone's just had a baby, than if they just like playing TV at maximum volume. Bit of give and take and all that.

Basically, I don't think there's really a hard division between 'objective requirement' and 'completely free favour you might choose to do' (unless the objective requirement is REALLY low, like at the legal level. But at that point doing what's 'required' would be seen almost universally as asshattery).

Social interaction is more complicated and blurry like that