@Jaidon, I got this was a joke first off, however the issue was not the manner of your joke, but, as people have said, your execution of it, since on the surface this could've actually read like someone who was pissed off and wanted to leave, despite the double redundency of your "I'm leaving" topics.
Remember, as has been said many times before, this is a forum, we don't get your tone and emotional weight only the bare minimum of your words, which is why when you're being sarcastic, you need to be as ridiculously sarcastic as humanly possible so everyone gets that you're being sarcastic.
Had you said something like:
"I'm leaving! I'm telling everyone that I am leaving since everyone should know that I am leaving! so I am definitely leaving! Here is me leaving! Want to know why I'm leaving? Well I'm so tired of people going on about how they're leaving, which is why I am leaving, , because leaving is what I am doing in this topic, just after I have explained to everyone how I am leaving because I am so tired of people's long explanations that they are leaving, which is why I am explaining to everyone that I am leaving! right now, ---- here that? that is me leaving! really! leaving, no don't try to stop me, I'm absolutely leaving! Not making a joke about all those people leaving? I wouldn't do that, not when I am leaving! right now, ---- just about now, yes, leaving!"
Hope this makes sense.
With our dreaming and singing, Ceaseless and sorrowless we! The glory about us clinging Of the glorious futures we see,
Our souls with high music ringing; O men! It must ever be
That we dwell in our dreaming and singing, A little apart from ye. (Arthur O'Shaughnessy 1873.)