Be sure to follow the rule before you head out.
Rule: You must post before you leave.
I'll give a pass to a quick check if it's potentially something vital, but your latest post and the responses can wait for an hour. Focus on the moment at hand. Same gripe I have with people who sit there and film an entire concert rather than watch it.
this sentiment is just gonna make people not want to be around you though, maybe be more interesting to talk to if you want people to not pull out their phone?
It's perfectly fine to just spend time around others without interacting with them, it's basically just parallel play for adults.
And in many cases this sentiment is just straight up ableist, people with autism/ADHD commonly use their phone to keep themselves stimulated and happy, if you tell such a person to put away their phone you're being a massive dick.
I may not actively tell them to put it away, but it'll be noted for the future to determine if I feel like bothering to go with them.
I have a young kid, if they have a friend over and put on some single player game while their friend just sits there I'm going to point out that it's rude to have someone over and not include them in what you're doing.
I feel like the original post rustled some jimmies