It had happened to me that when I send an e-mail some people get the wrong message of the original context.
The truth is, I believe sometimes people is so worried about what others think of them that anything can be hurtful or/and offensive; it's just a matter of self-confidence and how do you feel or think about yourself.
You know we are not immune to fails or misunderstandings, but could we be OK ever?
What I do is to ignore any bad comment against me, but taking what can be positive for me being a negative issue, like, I don't realize is in me but other people can see it?
Just listen the people you know in your heart is honest with you.