There will always different forms of social challenges at school. There is no denying it and when your child navigates those occasions well, they grow both in intellectual and social maturity. Here are some ideas to support them:

Teach Effective Communication:
Role-play with your child to practice different communication scenarios, such as how to ask for help, express their feelings, or resolve conflicts with classmates. Teach them how to express an ‘I’ statement that clearly states their feelings. For example: “I am sad that… I am unhappy when you….”
Encourage Empathy and Kindness:
Discuss real-life situations with your child where empathy made a difference, like helping a friend who was feeling sad or being inclusive during group activities. Also your modelling in demonstrating empathy and kindness are so important.
Promote Social Skills Development:
Enrol your child in extracurricular activities like drama, art, or team sports to improve their social skills, teamwork, and cooperation. Regularly engagement in sports and other group activities also teaches self discipline, learning to accept disappointments etc.
Provide Problem-Solving Strategies:
Share the "STOP" strategy with your child (Stop, Think, Options, Pick one), which can help them make thoughtful choices when faced with social challenges. Also teach about negotiation and resolving conflicts where compromise and understanding are included.
Foster Resilience:
When your child encounters setbacks or rejection, discuss the importance of learning from failures and trying again, emphasising that challenges are opportunities for growth. Talk about famous people who have experienced failure in their efforts to be successful.
Open Lines of Communication:
Create a safe and non-judgmental environment at home for your child to share their experiences and concerns about school. Regularly ask open-ended questions like, "How was your day?" to encourage conversation. Remember that in being non-judgmental your child will feel safe in talking about matters that are on their mind.

Encourage your child to be an optimistic and to feel that they can overcome social issues that they `come across. Let them learn (from the above suggestions) that there are many ways and means to work through social challenges. Of course the more personally confident a child becomes the easier the process of working more confidently through social challenges.

‘Promise me you’ll always remember:
you’re braver than you believe,
and stronger than you see,
and smarter that you think.
- Christopher Robin