I obviously don't know anything about your friend or those two conditions you mention (though I know a couple of people with adhd, or at least that what they've been told). Apart from that, it might be possible that age is a factor, too. I started playing in my teens, and up to around 30 I never really had the patience or drive to actually ever learn a real song from tab. It's hard work and it takes patience that I didn't have at that age. Playing guitar's tricky, and it's easy to give up (whether you have a condition like that or not, of course...).
But on the subject of "multi-tasking" - I've learned to realize that you should give the task at hand all of your attention and respect. Do only one thing at a time and do it with love. Very difficult to do, but it helps to calm a person down.
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