This sets off major alarm bells. In your previous thread
http://giftedissues.davidsongifted....r/203087/gonew/1/PreK_Social_Issues.html you said "His teacher had questions about social problems." Now that this bullying has come to light, which the teacher must surely have noticed, it is clear the teacher has been blaming the victim. I'd say this pre-K environment is toxic and you need to get out immediately.