Brutal customer service! Especially since a user is giving you a heads up about a possible breach and leakage of their personal information. I can fathom these types of replies if this was behind closed doors, but when you have an open forum like this, you are asking for trouble with snotty replies. This forum should be a PR beacon for awesome customer support!
Those aren't Dropbox employees.
They are representing the company as forum moderators whether they like it or not.
I agree with others that they should at least have the word "Volunteer" in their forum account title. Not just "Moderator".
You and I know they aren't dropbox employees, but I wouldn't expect most people to assume that. Thats a big problem.