Not necessarily.
To restate:
In the subset of CAD members, some are against the flat earth idea; they tend to be overall the ones acting irrationally aside from the point in question - but including it. For example, they might paint us as non-scientific - when it is undeniable that the flat earth ideology is firmly routed in science, and more so maybe methodology of science.
Those that are not tend to be the rational ones, aside from the issue of the flat earth.
I would not apply this to the whole of humanity though, and likewise I'd be hesitant to think I meant this universally within the group. Like any other belief, and as youtube has been so gracious to show us the last few years, we have our share of irrationals - and likewise our share of rationals.