Having done Aikido for a few months, I am starting to get confident in my techniques and must say that the most annoying thing is people who do not hold your wrist properly. Don't get me wrong - you don't need to try and squeeze someone's arm off but enough pressure so that you offer some realistic resistance.
No real danger of hurting anybody at least so no reason not to give a little pressure.
p.s. - oh, and I still can't bring myself to attack someone genuinely - just a big sissy I guess!