I'm curious for a native's opinion on how important these are. The etiquette I was taught growing up in the US is a mix of:
- several things that are often quoted as good etiquette but nobody follows (elbows off the table, correct order of dishes)
- lots of things that are customary but nobody cares if you don't follow it (napkin on lap, placement of silverware)
- only a few things that actually matter and would be considered rude by normal people (don't touch shared food with used silverware, keep your mouth closed while chewing)
Of these several dozen "rules" for chopsticks, how many actually fall into the last category of things that actually matter?