A major cause of anger and all other emotional reactions during interpersonal communications is mistaken interpretations, either wrong or distorted. This can also include positive interpretations.
For Buddhists, the second skandha (sensation) is the proximate cause of how we perceive (third skandha) forms (first skandha). The fourth and fifth skandhas (mental activity and consciousness) are how we consolidate or more often reconsolidate the original mistaken or distorted sensation. For more on this see: The Five Skandhas.
For non-Buddhists, if you watch your mind closely you will notice there is a short delay between receiving an impression and reacting to it, interpreting it.
For everyone, if you can be mindful of the second skandha (sensation) as it occurs and then interrupt the habitual firing of the next three skandhas by doing a FIML query, you will begin to truly observe how your mind (and your partner’s mind) really works. Each interruption of this type improves your mental and emotional functioning because you will observe an objective bit of reality and correct toward it. For more information see: Disruption of neurotic response in FIML practice and How the brain processes new information. ABN