DVC "guide" shouldn't have bothered sending the e-mail at all, or could have at least personalized it nicely, saying if your deal doesn't go through, please come back and buy through us. It was inappropriate, and she knew that.
I was given this DVC phone number (twice) - through another Disney 800# I had called and also by the reseller who couldn't answer all my questions. No one represented to me that it was another sales office - it was just the number to call to get my questions answered. It occurred to me it was a sales office when I found out that only the same person could talk to me a 2nd time - know that means commission system. They should have a better way to represent they are a sales office only.
Also to announce to me, both directly over the phone and indirectly through this e-mail, that Disney was going to definately buy back my contract was rude and inappropriate.
I tihnk you are over-reacting here. While I agree the sales person vented some frustration your way, and that it's not the way we would want to be treated, you are making more of this than you need to.
Settle down, wait for your contract to pass ROFR, and start planning your WDW trip. FTR, this guide will always be assigned to you so best to get over this perceived slight now. You won't have any other dealings with your guide unless you decide to purchase additional points through Disney, so stop making this into something it really isn't.