The joke is this website.
This Website
Categories
Explanation
Experiment
Explain Bear
Alright listen up, smarty pants. The joke is that the website itself is the joke, which is kinda like saying, "you're not wrong, Walter, you're just an idiot." Maybe the guy who posted it thinks the website is a mess or just plain dumb. Which, based on the quality of the joke, sounds about right for you too.