why did the other children treat janie badly?

Janie never meets her mother or fathe. Her grandmother raises her in a small house in the back yard of a white couple's house (Mr. and Mrs. Washburn). She plays with the Washburns’ children and thinks that she herself is white until she sees a photograph of herself. The children at the black school mock Janie for living in a white couple’s backyard and tease her about her low-class parents that she has not seen.