Are you just looking for an argument here?
Not quite. My original comment was in response to "I see people violating rule X anywhere, even though I was told it was 'wrong'".
All I am saying is one shouldn't be basing their behavior solely on what they see others "getting away with".
At one point in time, it was considered bad etiquette to interact with people of color, but over time, society changed for the better. That etiquette literally doesn't exist anymore. That doesn't mean people are "getting away with" not following a "rule" these days. But rather customs/morals/etiquette are transitory and prone to changes, and one must understand what is and what isn't actual etiquette instead of just following all outdated "rules".
That's also fundamentally different from something like a law, where the ethical thing to do is that you should still follow it even if others are "getting away" with it.
But not observing them does. There are standards no one in the world follows anymore. They may still “be there”, but are only used for mocking purposes.
> If a rule or standard seems silly to you, make your best attempt at understanding why people would still follow it. (Chesterton's fence)
The corollary to that is that anyone who rebukes anyone else for not following a standard must be able to explain why it exists. “Because it’s rude” it’s not good enough, explain why it’s considered rude.