A globe is a scaled-down model of the spherical Earth. It can be used to explain the down direction on the real Earth, which is toward the center of the globe. Flat-Earthers like to confuse the down direction explained by the model with that of the real Earth. In reality, the down direction we experience is different from that explained by the globe, which is only a model of the actual Earth.
Flat-Earthers often make an unreasonable demand that astronauts in space zoom in using a camera toward the upside-down horizon to reveal an upside-down object on the horizon.
If we cannot zoom in toward the horizon from a flight to reveal objects on the horizon, then it is unrealistic to expect astronauts to be able to zoom in to reveal objects on the horizon.
Horizon’s distance from a flight is approximately 350 km. We cannot zoom in on an object that far away because it is beyond the visibility range and would require a huge camera lens to resolve it. And it will be much more unrealistic to do it from space.
“Down” is the same direction as Earth’s gravitational acceleration, toward Earth’s center. “Up” is the opposite, or away from Earth’s center. This applies to all observers on Earth.
Flat-Earthers like to question & ridicule about what would occur on the people “down” there. They just do not understand that to the people on the other side of Earth, “down” is still toward Earth’s center, like it appears to everyone else.