Today again made me remember one stoic principle; only let things bother you, where you have influence on.
And yes, that's right. And no, you cannot influence every little thing. There are things in your environment, that you either have to accept or you have to leave the environment.
If you accept that, it makes your life easier. People have reasons why they behave like they do.
You don't do yourself good with trying to figure out the reason behind every thing, plus, you don't have the time to. Save your time for things adding more value to your life.
Like relaxing, enjoying a freaking good cup of coffee or tea and thinking how to improve your own life instead of the one of other people. It may sound selfish, but what do they tell you in airplanes? Put your own oxygen mask on first.