I notice this a lot. Those defending ball-Earth largely do not know their material as well as flat-Earthers. And those that do, don't seem to understand what secondary theories their primary theories depend on (e.g. they will defend one theory with another, not understanding Flat-Earth requires neither theory to be true).I have studied math and physics more than most folks.
'Twould be interesting to conduct mathematical/scientific testing for flat-Earthers and ball-Earthers. I would expect the flat-Earthers to average higher.