If being shown evidence of spherical Earth, they would respond to the person that brought the evidence using negative emotions, like anger and ridicule.

Logical thinking will emphasize the conflicts among the different explanations, but emotion will conceal them. It is the reason that in flat-Earth circles, emotions are much more dominant than logical thinking. They would attempt to reduce the discomfort by expressing emotions. And more often than not, these explanations conflict with each other. Instead, they had to resort to inventing a specific explanation for every single natural phenomenon. The flat-Earth belief system is unable to explain all the natural phenomena consistently. This phenomenon can also happen even without exposure to the correct information about the figure of the Earth. Others would accomplish the same by restricting the source of information, like blocking or banning the third party, to allow them to retreat to their echo chambers, and suppress the uncomfortable evidence.

If the flat-Earthers are unable to accept the reality that Earth is not flat, some will attempt to reduce the mental discomfort by expressing negative emotions, like anger or ridicule. Flat-Earthers often experience cognitive dissonance when they are exposed to evidence that disproves a flat Earth. Cognitive dissonance occurs when a person holds multiple contradictory beliefs or ideas and is typically experienced as psychological stress when they participate in an action that goes against any of them.

Flat earther definition