That sounds like a nasty email, indeed... When it comes to children's questions, mothers can be real witches, you know (to not say other words...). It's always bad when you discover you've done so much for someone and you're being treated like that. Real personalities are often revealed in such painful occasions. One day persons seem to treat you like like a precious stone, the day after they treat you like crap.
Oh well, just try to take it as an example of the kind of person you don't want to be in the future
