What I read made the analogy of someone with a painful splinter in their hand. If someone else should brush up against that painful splinter, the person might yell out in pain "Ow! You hurt me!" But, in fact, their reaction was really to the pain that was already there, not the pain caused by the person who brushed against the splinter.
I guess they call this "adding insult to injury" perhaps.
We have all known or seen people in extended states of emotional fragility. I need to keep this in mind when dealing with them.
This seems like a really dumb post now that I have finished it. Oh well.