I've never seen someone use cognitive functions to prove it's impossible to make observations about their observations?
Once you put an opinion or fact or post out there, i.e. "I tricked an ENFP", you're going to get people extrapolating observations and forming opinions about you. That's just kinda how (social) interaction works, and unfortunately no amount of stating "my internal workings exist only inside my head and are completely unobservable and not understandeable to the outside world according to MBTT" doesn't really cut it.
You seem very sensitive about someone possibly making 'incorrect observations' about how you feel or how your type functions, which is ironic considering this all leads back to your OP.
Also, considering there are several other members who've chimed in on what they think of your joke, maybe you should widen your diatribe re: "I'm not a bad person, you're just projecting onto me!" to the whole thread, instead of just me.
And I'm pretty sure people got that you meant this all as a big joke and were not taking it seriously, which I think is part of the reason you're getting the responses that you are.