Don’t tell me what to do
Most people dislike being ordered about. However, there usually comes a time in everyone’s life when they have to deal with being told what to do. It appears as if this youngster (we assume it’s a boy because of the writing) doesn’t want to be dictated to by Snow White.
However, this is one of the most direct signs available. The sign may be too overbearing, but it does at least ensure that individuals who aren’t authorized to enter the area should not do so.