Do people really ignore family and do completely separate things on their devices right next to each other?? Usually when I'm next to someone, I'm using my device to look up things related to the conversation, just like how I'd use a search engine during an internet discussion. I can't imagine just sitting around watching shorts right next to someone during a family gathering.
There isn't any need to "look things up related to the conversation", and if that is seen as acceptable then that itself is a sign of how things have changed, and how addicted we all are to information.