Your concerns about their idiocy are valid, nonetheless I think there's a need to question many things that are presented to us by a foreign source.
I personally had a hard time believing the flat earth model but I still watched some videos and thought about it for a while - it's all about re-evaluating things you thought to be clear and common. You seem to be pretty dogmatic yourself... although in many cases you may have a point.
It is quite normal to question this and that, and everybody do it in some level. Line of the insanity has past when you start to question what you have seen with your own eyes, and you start to believe crap you find from the internet, without questioning it's source or evidences. In fact, in many cases this internet is such a sewer, that you really need to work to find bits and pieces of real information, if you really need to know something. That's because there is so many dumb fucks who can write crap in the net, and so few reliably sources of information. As I have said, Internet has give a voice and equality to millions of very very stupid people, and they are here among us as we speak. People you normally doesn't meet at any point, if you don't visit in some institute or loony bin.