The Earth, by theorum, is not flat. Further than that - the claim that it is, isn't just based on what you know, it is a claim based on what OTHERS know, and think they know of how the scientific method works.
In their opinion, they should discard all reasonable ends they reach, and only stick with the ones they picked for their own means. That is NOT the scientific method. You DO NOT discard ANYTHING unless you have PROVEN without any doubt that other cases are not correct, and you base your proof on the methodology needed to prove it.
So, if you're explaining what an apple is to a blind person, you say: "it's food, this apple is sweet, some can be sour. It's a medium-sized apple, one that fits into your hand. It is a spherical-shaped object." And then you give the blind man the apple and tell him to investigate on his own and try to find anything wrong with that description.
He confirms it to be a sphere, but after trying it he says it's actually sour, not sweet.
You, doubting it not being sweet, do NOT SAY that it is and the man is wrong. You take the apple, and take a bite, and then concur it actually was sour, based on your findings.
That is the theory, reasoning, proving, and then reaching a factual statement, one that can be proven by others in the same way. Once said theory is proven enough times by different scientists, a real conclusion is given as something being universally accepted as true.
When you say that Earth is flat, and then continue to post videos of people who only use the scientific method to the first dot and disregard its latter part, then it is seen by all scientists that you are not stating something that can be proven true with a simple function of:
HE SKIPPED THE PARTS THAT LOGIC DICTATES TO SEEK AND DISPROVE APPROPRIATELY AND WITHOUT BIAS.
You are not a scientist nor do you follow its methods. You sir, have a problem on a deep psychological level that disables you from not believing only what you want to believe.