Etiquette rules, like the downward fork tines rule, that deliberately hobble the person making the display have a signalling value: it's the peacock's tail. Folks who've been able to spend hundreds of hours practicing how to eat in a deliberately hobbled fashion are then able to demonstrate finesse in that form of eating. Everyone else at the table will recognize them as being from the leisured class, whose parents either had sufficient servants to spend time drilling that technique into the children, or who invested that time in lieu of other pursuits in early adulthood. Either way, you're demonstrating that you've had time and leisure to spare. ...It isn't really a joke. Not knowing which signals need be sent and which are just purposelessly costly is costly. Here's Tressimc (HT: +Althea Parker-Wood)
If you could deduce etiquette from logic, it wouldn't be etiquette. If it's not a costly signal, it can't induce the separating equilibrium that keeps the farm boys like Scott and me from having airs when dining with our purported betters.
Down with the tyranny of etiquette and its oppressive class-entrenching function! Up with efficiency! Ecraser l'Infâme! Join me in the revolution! All you have to lose are your chains!
In contrast, “acceptable” is about gaining access to a limited set of rewards granted upon group membership. I cannot know exactly how often my presentation of acceptable has helped me but I have enough feedback to know it is not inconsequential. One manager at the apartment complex where I worked while in college told me, repeatedly, that she knew I was “Okay” because my little Nissan was clean. That I had worn a Jones of New York suit to the interview really sealed the deal. She could call the suit by name because she asked me about the label in the interview. Another hiring manager at my first professional job looked me up and down in the waiting room, cataloging my outfit, and later told me that she had decided I was too classy to be on the call center floor. I was hired as a trainer instead. The difference meant no shift work, greater prestige, better pay and a baseline salary for all my future employment.This is one reason a fair few welfare-to-work programmes provide some basics about interviewing: explicitly telling people what others already know.