Why do people who know nothing about working out and fitness think they know everything about it?

You see the guys at the gym who are 100 lbs overweight or are 130 lbs who you try to give advice to even when you're in shape and it's obvious you have experience in the gym and they laugh at you and claim they know every diet secret, everything about sports nutrition, everything about exercise physiology,... show more You see the guys at the gym who are 100 lbs overweight or are 130 lbs who you try to give advice to even when you're in shape and it's obvious you have experience in the gym and they laugh at you and claim they know every diet secret, everything about sports nutrition, everything about exercise physiology, etc etc, yet you listen to them and they know absolutely nothing,saying how they get in shape taking vitamins and greens shakes and stuff and you look at them and like "ok dude...." as you stare at his 50 inch pot belly
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