Jenniffer said it pretty well. Who would expect a web-board to communicate in the same way as academia?
I don't understand this need to prove that someone wasn't constructive. Maybe he thought he was, and wasn't, maybe he was semi-constructive and semi-derogatory, or maybe he was just trolling you. Now, I have to ask, how are you goign to successfully run a web based project if one single criticism which you don't find constructive, drives you to this reaction? :confused: Why not just let it go? For someone so centred on being constructive, it seems like an amazingly unconstructive way to spend your time.
And also: why so hard to imagine that someone might think they are being constructive from their point of view, though this may not fit in with your vision.
Could this be a language issue? Constructive doesn't mean the same as "specific tips"...maybe you should have been more clear what you wanted, and said "I'm happy with the overall look of the site, but would like some small tips on how to make it more user-friendly". Then, people would now within what framework you wanted to hold the discussion...surelyfor an academic this is basic stuff?