It’s true. Our words and actions, especially when things are stressful, undermine what we think we are. You may think you’re being a good boss, and maybe most of the time you are, but those days when you’re stressed and short with people or the days you decide to not deal with a problem, become the days that define you in the eyes of the people who report to you.
To them, you aren’t just another person having a bad day. You are the person who controls their success at this company for better or worse, so it’s not just you having a bad day, it’s the organization having a bad day, directed at them.