ABC News reports
on a Washington State school district that has banned Halloween celebrations this year, in part because "Halloween celebrations and children dressed in Halloween costumes might be offensive to real witches."
Now it's great that the school district wants to teach the kids to be respectful of different beliefs, etc... but in this case their decision seems a bit confused because witches are not, in fact, real. A real witch, historically speaking, would be someone who possesses supernatural powers. The Wiccans call themselves witches, but I'll go out on a limb and wager that they don't possess any supernatural powers. Therefore, they aren't real witches, in the historical sense of the word. So there really should be no need to worry about hurting their feelings during Halloween.