My 9 Year Old Grandson Was Bullied At School 2

My 9 year old grandson was bullied at school 2 weeks ago. Understandably he now does not want to go to school but he won't wear certain clothing eg won't get out of his bath as he doesn't like his pyjamas; won't wear long pants on cold days. Could this be Sensory Processing Disorder? He may well have tendencies of Aspergers but is affectionate, has good ball skills, does not do repetitive activities, etc. Please help.