This is inspired by the thread about the restaurant offered a free (birthday) meal as long as five people were dining - which turned out only applied to five ADULTS, but according to the OP it wasn't specified that it only applied to adults.
Many people are saying that it's "common sense" that such an offer would apply only to adults and some are questioning the intelligence of anyone who wouldn't realise that.
I commented that it would not have occurred to me that such an offer only applied to adults dining and a couple of people have been a little critical of me for that. Because apparently it's "common sense."
Well, maybe I lack common sense. My mother has often told me that I have none.
So my point is - surely so-called "common sense" isn't actually as common as many people believe it is?
People's minds work differently, people understand things differently. People who are neurodiverse sometimes take wording very, very literally and can sometimes need things spelled out to them that would seem obvious to others (I am autistic myself.)
I do find it unfair when people insult/mock or imply that someone is lacking in intelligence for not having "common sense". That doesn't make them stupid, it just means that their minds aren't connecting the dots in the same way that other people do.
I'm not sure that "common sense" should be as much of an expectation as it seems to be.