There is always a reason for the way one is. This is just the truth. One aspect of this is temperament. I am sensitive by nature, so many things impact me more than they might have impacted others. But we also grow up with a very subjective understanding of what is ok, what is acceptable and what is normal. Beyond our own personal experiences we form judgments based on what's in the news and what we see in fiction. So most of us know by the time we are adults that someone who has endured beatings, molestation, dire poverty or war is likely to be traumatised. But in fact human interaction can be a lot more nuanced, subtle and ambiguous than it is in such situations and STILL be extremely wounding.