Nobody ever heard of multi-tasking? I can do at least two things at once - hell, I'm watching a movie as I type this - so looking through my little book of set-lists to avoid repeating songs I did at a club the previous time I was there, and noting down my next song whilst listening to the person currently performing, is no big deal.

I'm personally far less offended by the guy leafing through his ring-binder while I'm performing than I am by the one who gets up to go to the bar, or take a piss, every time my turn comes around to perform! 😎