Staying angry will ruin your focus and prevent you from being productive. Let go of it quickly so you can focus on what’s important. Your time is limited, don’t waste it thinking about things you can’t control and making yourself feel terrible.
It’s natural to have moments of frustration, but you can always come back to yourself. You have a right to be angry sometimes. The main thing is, don’t allow it to ruin your day or someone else’s day—or worse, your life or someone else’s.