Viewing the initial question from a perspective of social status the answers the article makes have pretty simple answers. Males competing between other males in video games and win gains a perceived gain in social status, so when they put down the game and face others around them there is a natural clash as the social status gain is seen nor recognized by the social environment outside the game. Aggression is common…
Where do you think those differences in social status competitions originate from if not from brain differences?
Cultural acceptance / expectations account for a lot of behaviors. I played soccer & baseball as a boy because that was what was expected of me, not because I have some natural inclination to do so.