C.S. Lewis would not agree. In the beginning of "Mere Christianity" he says that if one agrees to split an orange with someone and you give a smaller piece, it is a natural, innate reaction to consider that unfair.
Wandering off topic, but I can use some diversion. Thanks for posting.
As a Buddhist I would consider that “innate natural reaction” (and I agree that it is) to be an emotional neurotic issue. The person who takes the bigger piece of the orange also has neurotic issues or he’s psychotic and has no emotions about it at all.
As for the action being unfair that is a mental fabrication overlaid on the reality of it. The reality is that one person took more than half and that’s just how it is. There might be a number of reasons for why he did. Selfishness, lack of mindfulness, stupidity, poor vision, ... without a deeper knowledge of the reasons for his actions one can’t determine intent or lack of intent so even by the artificial concept of fairness it’s not possible to know if the rules of fairness were violated.
FWIW I think an understanding of what fairness really is and is not is relevant and on topic. You also began this as a discussion intended to lighten things up so this take on it is on topic in that respect as well.
But this is your thread so you are the final arbiter of that. It’s only fair. :-)