DEAR MISS MANNERS: Growing up, when visiting my grandparents and other relatives, I remember the TV would be turned off when we entered as guests. I remember music playing when we had Christmas parties or other family get-togethers, but the TV was always turned off. But lately, when visiting friends, relatives and others, I’ve noticed more and more that the TVs are staying on. In many cases, they are not even muted. In my opinion, it is very distracting and, honestly, rude. Is it rude to have the TV on when guests visit, or am I overreacting? GENTLE READER: Overreacting? When you consider how …