There's an old Taoist parable I like a lot, about an empty boat.
If you are rowing your boat down the river, and another boatman crashes his boat into yours, you will shout and curse at him and tell him what a fool he is, and all day you will feel angry about the stupid boatman, and you will go home and tell your wife about the idiot boatman who crashed into you.
But if an empty boat crashes into yours, you will push it away with your oar and carry on your journey. You won't think about it any more.
So when something happens to frustrate you, tell yourself "It doesn't matter. It's just an empty boat", and don't think about it any more.
I like that a lot.