According to Osho, don’t force self-control when insulted; control is repression. First, try to watch the surge of anger. If watching isn’t possible, respond honestly rather than suppress, but accept the consequences and choose your battles. Authenticity educates; repression doesn’t. With growing awareness, reactivity fades, and at enlightenment one simply accepts insult—no doer left, only witnessing.
Either calmly watch your feelings, or if you can’t, react honestly and learn from what happens—just be ready to face the results.