We have a friend who will sit and text and piddle with their cellphone while we are having dinner in a restaurant or at our house then get upset if they are left out of a decision or important conversation. My tongue has bled many times. It is so rude. You wouldn't have a separate conversation at dinner with another person at the table so why would you converse with someone using a cell phone? If it's that important, excuse yourself from the table. I've often wanted to text this person myself when this is happening just to point out how rude it is but I haven't. I really think people get so wrapped up in their electronic devices, they don't think about how impolite it is. DH has even picked up his cell phone and checked messages when I am talking to him! I don't let that one slide.