Why was it they were so unconcerned about nastiness from the dude's hat, his feet, and their hands...Perhaps the sanitizing portion of that segment was edited out? Do I not need worry about being sanitary when I'm open fermenting outside like a boss?
If you're worried about it. Brew up a batch and take one gallon and try open fermenting with it. That way you won't run the risk of messing up a whole beer. Who knows, you could find a sweet brewers yeast floating around your house...