One of the things my parents did understand correctly as “new money” is that a significant portion of piddling etiquette rules about what color to wear at what times of the year and which fork goes on the left were largely ways for the bourgeoisie to attempt to maintain their advanced standing against the increases in (the potential for) equality that capitalism initially brought about. Unfortunately my parents are also a very “well we got ours so everyone else must be lazy” type of people who think that’s as good as equality can or should get.

Except etiquette extends beyond just “common social etiquette”. Using a knife and fork the “correct way” is etiquette. Eating soup by scooping the spoon away from oneself is etiquette. Placing your cutlery the correct way on the dish when you’re finished is etiquette and varies wildly by country. These are just examples of dining etiquette, there’s much more. Its all bullshit and I agree it should boil down to being respectful and mindful, but depending who raised you it may happen that you get reprimanded and punished for not following very arbitrary rules.