You never know ones "state of mind".
Perhaps you haven't heard about the young father shot point blank range in a movie theatre in 2014 (Wesley Chapel, FL) he was texting his babysitter during the movie previews. this crabby old retired cop shot & killed him because his phone was "loud" when texting "annoyed" him. It was 1:30 matinee. He asked him to stop - of course, much controversy surrounding what really happened.
This old man is now trying to use the FL law "stand your ground" because he felt threatened! 😡😡😡😡
I never have my phone on when I enter a public place nor do I carry on conversation on phone others have to listen too- in lines, etc. I'd rather call that person back.
I keep it on silent just as a courtesy.