DEAR MISS MANNERS: Gifts used to be something one put thought into. Unlike some of your readers, I don’t mind wedding registries. I treat them as guides, not demands, and don’t feel constrained to purchasing from the list. I find them especially useful for members of my husband’s family whom I don’t know well. (He’d forget to buy a gift, and I don’t mind.) However, I just got a list of recommended gifts for a 7-year-old’s birthday — including a $200 electric scooter, which I was specifically urged to purchase. I explained that I had already sent an age-appropriate building set. The silent dis…