From the magical mailbag, a reader asks, “I’m not sure if I’m overreacting or not. Every year at Halloween, there are green, ugly, warty witches everywhere and my son keeps asking me to buy one. I don’t want him to think that witches are ugly – after all, his mommy is a witch – but it seems like it’s all over the place at Halloween. On the other hand, I know it’s meant in the spirit of fun and silliness, and I don’t want to make a big deal out of something that’s small. How can I figure out a way to talk to my son about the stereotypes of…