There are times when we seem to walk blindly into challenging karmic circumstances. Temporary blinders are necessary because most would not consciously choose to engage in the discomfort required by the soul for growth. Strong emotional reactions typically indicate that karma is in play.
In challenging circumstances, seek the gift or the lesson by going within. Once the situation has served its purpose, it will either no longer be required in your experience or you will feel completely neutral about the person or behavior.
Everyone who enters your life has a role to play in your growth. When ready to heal old emotional wounds, the higher Self sends an energetic call out into the universe requesting assistance. Those who answer the call are willing to play a role (typically adversarial) to bring the energy of the wound to the service. These loving souls are willing to risk losing our love and goodwill in this life to assist with our awakening.