There was a guy in my guild who I sure as hell knew was a basement dwelling leech IRL capable of leveling to 110 in 24 hours and gearing to mythics in another 24. He would chastise the PuG for not knowing anything during dungeons and question the relation of their ability in this game to what they do IRL, believing if you're a winner in this game, you're likely a winner in life.
To many, the only thing they'll ever accomplish is a video game. Accept it and move on.