If you follow the discussions on this forum you will notice that flat earthers reject any and all evidence that disproves their hypothosis. Including their own eyes.
They operate from the assumption that they are right about the earth beying flat, and that therefor 'logically' everything that does not support their view is inacutate.
This makes any and all debate futile if you want to convince anyone with reason.
But the upside is that by arguing against their increasingly lunatic views ('innertia does not exist', 'gravity is caused by air', 'pinguins are man-made') you do learn more about thr actual real science of it all.
I'd add that being here gives you a good laugh every now and then.
Plus, it's an intellectual challenge to prove round earth and disprove flat earth. If you hear about flat earth for the first time, you might think "wow those guys do have some points". But thinking about it a little bit further makes it easy to disprove it.
Additionally, I find it psychologically interesting why and what people do believe in a flat earth.
Also its kind of a "strech of your boundarys" to try to imagine completely different views of our world and try to understand those.
Last but not least: You can satisfy your need of trolling
If you try to seriously argue with flat earther, you'll quickly see: It doesn't work.