Stupid is a problematic term, because many people use it to categorize people who are very smart and but adhere to questinable belief / epistemological systems.

People that are incoherent, don't normally get their claims accepted. The admins after all don't want gibberish in their debates.

People that have very different points of views, get their claims accepted and get them rebuked underneath. We believe that sunlight is the best disinfectant. You need to spell out bad thinking and then debunk it underneath.