DEAR MISS MANNERS: I had a formal sit-down dinner for eight guests at my home. One guest was on her phone nearly the whole time — texting and even watching live videos that her friends posted while others were trying to have a conversation. She was away from the group, but the sounds were still audible. She arrived late and stayed by herself, on her phone, during the cocktail and hors d’oeuvres time. When it was time for dinner, once everyone was seated and the food was being passed, she got up to get the hors d’oeuvres and bring them to the table. Then she got up again to go to her car to br…
