Joking aside: theres the school version of pioitesse, and the actual version.
Naturally, both are ultimately evolved into appearance, not substance (because of courae this difference isnt substantial).
For me it’s the fact that these days it’s very inconsistent. The “rules” were pretty clear 20-30+ years ago. Now it’s a bit of a mess and there is a lot of overlap.
> Saying people like myself aren't worth your time sounds like sour grapes
I mean.. you’re somebody who just claimed that a random person is autistic because he doesn’t conform with some social norm you find to be somehow extremely important (specifically) in your environment. So it might not be such a bad heuristic.
there is never a question what to use when i am talking to cashiers, clerks, etc. but when i am at a tech meetup or an informal gathering of people from different companies then the way to address people is very much in question. you never know how people like to be addressed. and while using the formal option may seem like the safe choice, it really isn't because it forces others to be formal with me too, and when i am the only one doing that it puts me into an odd position. the only safe option is to avoid any choice until the other makes their choice.
I'm in a country with this distinction, too, and I don't like strangers addressing me with the informal just like that. Every sociolinguistic setting is different, but using just the informal might not automatically create rapport but the opposite. Saying people like myself aren't worth your time sounds like sour grapes, and depriving oneself of new social ties does have its negative impacts on life.