Live peacefully
Tell him that children need to live in peace, not bully others, and that bullying children should be stopped politely.
Don't swear.
Swearing is a very impolite behavior. In order to prevent children from swearing, in addition to not swearing, we must also avoid contact with children who love swearing.
Civilized and polite activities
Take children to participate in some civilized and polite activities, so that children can truly feel the importance of civilized manners in our daily life.
Convey politeness
Encourage children to do more civilized propaganda and let him know that it is also a courtesy to convey politeness.
A polite child
If we persist, then our children will become polite children and be loved and praised by everyone.