Flat-Earthers like to dismiss evidence of spherical Earth as fake. But if we challenge them to witness it themselves, they will avoid it. They will even turn a blind eye to offers to compensate them if their claim of fake evidence is right.
It is a form of willful ignorance. Deep inside, flat-Earthers are not even sure Earth is flat, or even subconsciously understand Earth is a sphere, but they emotionally believe a flat Earth anyway. Unwilling to let go of their belief, they purposefully ignore any evidence against flat Earth.