I am consistently appalled when seeing someone on their phone instead of interacting with the person next to them or enjoying the scenery. Apparently, you are allowed to stare at your phone while you are out to dinner. This is socially acceptable now. Fine.
There are some spaces that should remain sacred. These should be the cell-phone-free corners of the world, places where it is always inappropriate, unnecessary, pointless to be looking at, talking on, texting with or even holding a phone.