Todd,
I feel your pain man. We all have our moments of clarity and our moments of darkness and responding in the way that this guy responded is not a professional or even a bit helpful in my opinion.
Please don't get discouraged by this experience. I've encountered my share of people like this in the hobby, but the helpful and friendly individuals far outweigh that bad.
Now on to your problem. This may sound stupid, but being an analyst by heart, I'm good at seeing patterns and as of lately, I've seen what you have described happening to many others in this hobby, in a very similar way.
I don't know what is causing this in our area, but the data is there and we need to figure this out at some point.
Many have blamed Chloramines, Chlorine, Copper, chemical warefare between corals, etc. And I have no idea if any of this is true or even possible, but they all sounds like good possibilities that are worth exploring.
I really hope we all join forces and figure this out soon, because many beautiful tanks are being lost to this problem and that is a shame.