The joke is the absurdity of a flat earth and making puns like "all around the globe" in that context and creating absurdist proof that the Earth is flat despite everyone knowing since kindergarten that it isn't.
There's not much I miss about Reddit, but one of those things is a proper community to put jokes that have been run into the ground. The unnecessary arrow is one thing, but then the second reaction image really kill the otherwise mildly amusing joke.
I'm just waiting for Elon Musk to come out as a flat earther. It's about as absurd for the CEO of an EV company to support Trump as it would be for the CEO of a space company to believe in a flat earth.
He seems like the kind of person delusional enough to claim that he invented the portal that transports you from one end of the flat world to the other to explain why planes can cross the Pacific.
The Flat Earth Society is meeting here today /
Singing happy little lies /
And the bright ship Humana is well on its way /
With grave determination, /
And no destination