As our stress levels increase or as we are chronically in a stressful (fight-or-flight) state our mind's ability to be easily triggered and reactive increases. We may say and think things that we normally wouldn't say or think if we were in a calmer state. Actively practicing stress management can allow us to be a "better" version of ourselves when dealing with others.
The human experience is a fascinating thing. We are born into this world; we have no conscious choice of our parents, nor of the city or country we live in, nor the time in history in which we appear. We are born, we grow and mature, and we have experiences. Everything we are exposed to on every level of what we are, seems to affect us throughout the course of our existence. It seems that we are like these infinitely dense bio-psycho-social-spiritual sponges that absorb everything, whether we are conscious of it or not.