I have not. Ever. Not once. I frankly find it baffling that such a thing would ever occur.
So there we have a problem. You have a set of experiences that indicate that the chances of a breach of the unwritten premises of a game is significantly higher than the chances of a similarly problematic rules dispute. I have a set of experiences that indicate the opposite.
It might very well be that we are the problem ourselves. We appear to both be rules nerds, but we might still have different approaches to how to interact with rules in a social context. In particular it might be we have different relationship to written and unwritten rules.
It might seem like you find unwritten rules brittle and rigid due to the challenge of communicate around it, while written rules are easy to bending and forming to your needs as you can readily talk around it, and that way build an explicit consensus.
Meanwhile I find the unwritten rules more flexible as any reasonable interpretation of them are generally accepted, while written rules are tight and brittle as their written form works as an outside authority that need to be interpreted and might have different meaning and importance to the various members of the group.
That is while consensus building is more
possible for the written than the unwritten rules, the actual
process of building that consensus might be
really hard in a group of players that is strongly opiniated about various subtle details in the rules.
I do recognise that this category of people might be in a minority. Me and both of my brothers happens to be so, which mean I have likely been exposed to the issue a lot more than average. I have had clashes with other players as well, so my family is not unique. But that means that if you yourself are quite lentinent and accepting about what rules are at play, and how they are interpreted, (as long as they are explicit and written down) it might not be so surprising you have not found yourself at a table where this type of situation has been a problem.