If You Thought Flat Earthers Were Bad…
Imagine being a tiny speck on a tiny planet orbiting a tiny sun in an entire galaxy, which is just a tiny speck in the scale of the universe. Now, imagine trying to dismiss the entire universe because you think you’re the center of everything. What you would end up being is the first commenter in this picture.
By definition, outer space is the physical universe beyond our planet’s atmosphere, meaning everything else in the history of existence outside our blue planet. Or maybe this person isn’t being ironic, and the rest of the world is just plain wrong.