2. Any person you deal with is also a human and has the same ability to control their reaction to anything.
Therefore, someone's reaction is 100% their choice, just as it is yours. We all have this ability, few of us exercise it. However, it is not my own fault that someone else doesn't exercise this control.
> "Men are disturbed, not by things, but by the principles and notions which they form concerning things. [...] When therefore we are hindered, or disturbed, or grieved, let us never attribute it to others, but to ourselves; that is, to our own principles. An uninstructed person will lay the fault of his own bad condition upon others."
- Epictetus