Joke? Then you don't get it. Let me explain it to you, son: it's a caricature on conspiracy theories like chem trails or flat earth etc and shows how easy it is to create a whole world of fake facts around it. Oh, and I'm sorry that I had to tell you the earth isn't flat. You good now or do you need anything else? I'm happy to oblige.

If you have never seen a dumber or unoriginal or more annoying joke... you are very lucky. Or have only been "on the internet" a few times.