Granted I'm not condoning snarkiness or a return to the atmosphere of previous cycles, I think the part I highlighted in what you said could bear some repeating as well.
If our main concern here is to keep this a welcoming and positive atmosphere (which I agree it should be), then I think a consideration of the feelings not only the admitted students is important but those who are suffering in limbo. Maybe we could all do better to be sensitive to each other's situations and emotions in this tense time?
For my part, I was trying to deflect any angst over the results board post with a lighthearted joke. I apologize for it, in hindsight, that it became too personal but at that point my mind was on trying to help the folks who were hurt by it via humor.