You misunderstand. You have been indoctrinated to believe the round earth is a fact. So, you come here and annoy people who don't share your beliefs.
You are no different from someone who joins a religious forum and then argues that God does not exist. Or someone who joins any community and then argues that they are incorrect. You are rude and disrespectful. Personally, I find you people objectionable.
It is in fact you who fail to understand, the shape of the earth is not a belief, it is not part of some religion, this forum is not closed to time travellers, people claiming to be speaking for andromedian's, some who think that air and clouds don't exist, some think that Obamumists built the fake mountains, some think the moon is a hologram. Some think the earth is concave, some think the earth is an infinite plane at the bottom of the universe, some think the earth is hollow and populated by aliens. Some think that the Apollo program was mankinds greatest achievment, and the earth is round. Some think the earth is flat and the south pole doesn't exist.
Conspiracy nuts like yourself, have a natural distrust and dislike for the truth, especially when it can be clearly shown that the conspiracy is not real. It must be hard to carry the belief that the earth is flat, while all the time everything around you screams out that it's round. Your only hope is to put your hands over your ears and shut your eyes and shout La La La La...
Maybe you could just say the whole world has been faked. Truman Show on a global scale. Or you could go join the tfes.org