1. Regarding calling names. In my experience, "Flat Earthers" are more interested in facts, experimentation and logic. Simply put, they don't need to resort to name calling.
FEs don't usually call names, except occasionally when they lose patience; as they are constantly attacked.
Let me put it this way:
If I told you, "I was talking to John this morning, and I called him a brain dead simple moron who should be sterilized for the good of society." You'd be like "OUCH! Did you have to be so brutal?" but then if I had added, "after he tried to convince me the earth was flat". You'd laugh and high-five me. ADMIT IT.
In other words, it's like punching nαzιs. If you said you punched just about ANYONE ELSE, people would be critical, unsupportive of your violent behavior, and wouldn't get behind you for it. But if you said your assault victim was a nαzι, you could punch him all you like and people would high-five you. It's part of the programming everyone receives today.
Seriously, there are few other things that are so "open season" according to the modern world, as being Flat Earth. Why?
As a corollary to this, it means that a FE calling a Globe-believer a name is NOT the same thing as a Globe-believer calling a FE a name. Ever heard of "punching down"? AND YET -- 99 times out of 100, the verbal violence is FROM Globers TOWARDS FEs.
How can this be, when they have the full support of the mainstream scientific establishment, the whole world, the entire media, etc.? They should be more secure psychologically -- they shouldn't feel so defensive and scared, where they have to lash out and tear down FEs personally all the time. BUT THEY DO. In fact, some of them are quite vile (attacking spouses, children, making slanderous accusations, etc. -- being quite degenerate).
If the earth were truly a globe, then people would be mildly amused at best at "those weird few" who believe the earth is flat. Why would they waste their time creating a Youtube channel dedicated to bashing flat earthers?
Does anyone create a channel dedicated to the fact that Elvis is dead, or that politicians ARE NOT space aliens? Of course not. It would be a waste of time.
In conclusion -- I consider this a pretty serious argument for Flat Earth in itself, even though it doesn't even begin to address the myriad physical evidence. Unfortunately for globe lovers, the physical evidence is MUCH more immediately relevant, convincing, and powerful. So my point, addressed in this post, seldom gets brought up.