On Common Sense and Fanaticism
All human beings exist in their own little ruts and are experts in whatever it is they do all day.
Try going somewhere you've never been before and doing something you've never tried before.
Odds are, the people you meet there (the people who go there every day and do that thing every day since they were born) will come up with all sorts of humorous insults and make it absolutely clear that you are not welcome.
Not necessarily because you aren't familiar to them, but because you don't have any "Common Sense."
"Common Sense" is a word used to describe any knowledge that a person has that they assume everyone is simply born with. For years I've worked in a hospital where I process paperwork all day. To me and my coworkers, it feels like common sense that you shouldn't roll up finished paperwork in a tube with a rubber band. All day long I have to listen to my coworkers lament how all these supposedly intelligent doctors and nurses completely lack "Common Sense."
That's why I have a special place in my heart for the "Fanatics" of the world. A "Fanatic" is someone who loves what they do so much, that they truly believe that everyone in the world would love it, too. If only they gave it a chance. Games, Hiking, Movies, Religion, whatever.
A fanatic simply stumbles across something that they love so much, that they completely attribute that feeling/experience to the object of their affection. They don't see love as having anything to do with their-self, personally; all humans are just born capable of feeling the same kinda way about D&D or Jesus or whatever.
Fanatics aren't smarter or kinder or posses any greater Theory of Mind, (In fact they're usually pretty toxic people) but they never use the phrase "Common Sense." They at least understand that there was a time *before* they knew what they knew.