The flat earth thing was created to discredit other conspiracy theories.
Say you have a good one such as "The refs are always helping the Pats/protecting Brady, why is that?" Every front running, knuckle dragging Masshole can then come back with "What are you a flat earther? Of course the refs can't preferentially protect players. It's just the Patriot way, bud. You're just not used to it, being from dumb Buffalo and all."