As you GAL and move on this will have less of an impact on you. I believe this is to teach us how to set boundaries with these people in a healthy way for ourselves. I would not respond as its really not worth a response.
Just so you know my EXW will still show this side and its been years. I never respond. It doesn't really affect me.
This has helped me deal with all sorts of people who are like this in everyday life, business, family etc.
This is a gift in more ways then one if you can get past the hurt and see the benefits. Not an easy thing but one that will greatly help you in the future.