I think it's another of those self-fulfilling prophecies. I've heard about this since I was very young, and it's fairly wide spread and "alive". Young girls are encouraged to do many things at once and be social and young boys are encouraged to focus on one thing at a time and be more introvert. Certainly it's more socially acceptable for a man to be really really good about one thing and hopeless about everything else than for a woman. (A friend of mine pointed this out years ago when we were discussing why there weren't that many female "guitar gods" - girls are simply not allowed to devote enough time on say guitar practise to become really good at it.)
I think a lot of men "hide" behind their supposed inability to do more than one thing at a time. Pisses me off every time they do.
On the other hand, I heard about an experiment where they filmed a stairway, and amongst those who were chewing gum a lot more of the men stopped chewing when they climbed the stairs. Could be an urban myth though.
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