When I first began reading your posting, I was getting mad.
As I read further, I realized it was sarcasm (well done).
Ending with a sarc tag might prevent some folks from believing what you wrote was true.
The beauty of effective sarcasm is that it is almost indistinguishable from reality. Unfortunately we live in an age in which every crazy idea imaginable is espoused by someone. So, it is often hard to tell the difference.
Yeah, it was probably not nice of me to leave off the “/s” but I sometimes do because it operates like a spoiler that everyone sees before they’ve actually read the comments. And that robs them of the sudden realization that it is sarcasm—like you experienced. Achieving that is half of the fun.