Please be aware of the Forum Rules of Conduct.
He's leaving. You don't have to troll him and tell him good riddance on the way out. If you can't just wish him well, then keep your hands of the keyboard and go find some other thread to snark on. All you've done is validate his crappy attitude and given a poor image of the community to anyone reading this thread. Nicely done.
Personally my comment on Perdan imploding was about how stunning it is, not rubbing it in anyone's face.
I did realize that's what your comment was. I wrote my post using the mobile version of the site (hence the cell phone icon for the post), and it doesn't warn you of posts made while you were writing yours. I didn't see your post until after I posted my comment.