You are your child's best instructor in learning how to communicate effectively. Reassure him you are nearby, but challenge him to solve problems himself. Whenever you have a problem, talk through the steps you are taking to remedy a dilemma. Kids learn best through example. It will lessen their chances of becoming victims of peer cruelty.
Polite kids are well liked and have an edge on success.
To enhance children's social competence, teach one skill at a time. Tell him why it's important, show what it looks like, give opportunities to practice using it, and then review his performance. Kids like to be around kids who build them up. Begin with the easiest goal to tackle so they experiences more immediate success. Too many goals scatters your child's efforts and can lead to disappointment.