I agree with what has been said. In the future, if you want to have this type of conversation with someone, it is more appropiate to say it to their face so that it at least has the chance to take the form of a discussion, rather than a monologue. If possible, it is always good to have a third party (i.e. your trainer) present to moderate if the discussion becomes heated and either party becomes unfair to the other.
More importantly, if this is someone that 'hates' you, what on earth are you doing working their horse for them? Of course not everyone in life is going to like you necessarily but if someone is already causing you trouble, working for them is not a smart decision, especially if you don't have to.
Edited to add: If someone had have sent me a message/email similar to your first one, I wouldn't have even bothered replying, not worth taking seriously. Sounds like you are both young. When you get older you will learn more appropiate techniques for dealing with these types of situations so that a more positive outcome can be achieved.
All horses deserve, at least once in their lives, to be loved by a little girl.
Last edited by sarahver; 10-20-2010 at 11:31 PM.