One of the many reasons why I will never be a great writer (and probably not as important as just not being a good writer) is that I don't really know what goes on in other people's heads.
I learn this again and again and sometimes I remember this lesson.
In its most basic form I have to remember that my interpretation if what somebody says to me is massively affected by my mood. So if I take something badly it says more about my mood than it does about the other person.
So if I am upset by something someone says to me I try (don't always succeed) to take a deep breath, think about my mood, and remember that most of the people I know are kind and lovely, and most people I don't know are benign.
And if I don't let my mood colour my relation to the world, I will find the world a much easier place to live in.
Now bring me jam tarts!