Ovinomancer
No flips for you!
Not at all. I'm happy the poster has rejoined the discussion considering previous comments.
I'm beginning to think that you may be tone deaf. When you anger someone enough to say that they're done with you, that statement is almost always made in haste and emotion, and the person will almost always return. However, making a post that does nothing but note their return against what they said is guaranteed to continue to upset that person -- no matter how you may intend it, it's one of those things it's just a jerk move no matter what. If you intend to be a jerk, as most people that say 'welcome back' to a poster that has said they're leaving are, that's fine, the statement matches the intent. In which case my comment that it's unnecessary snark, as it in no way improves the conversation, is spot on. If, however, you really do wish to be nice, it's far better to NOT say anything, ignore that the person ever said they were leaving, and continue on as if nothing happened. You can send them a PM explaining yourself in detail if you'd like. Because there's just about no way to make that post, especially without any additional content, and not come off as a jerk looking to poke someone.
My advice, if you don't intend to be a jerk, abandon this line of statement. There is no benefit to saying this, only downside.