but, see i totally disagree with this. I think you have it the other way around. I would say the lack of skill/knowledge would be the most important factor first. knowledge meaning, how to get out, where to be in the line up, the rules of the line up, how to turn, how to read waves...ect. I'm old school where the word "kook" meant all i described previously. Nowadays it seems the word kook has slightly taken on added meanings.
But disrupting others in the water would be a lack of knowledge. So i guess you could consider that a kook.
Ok, i can agree with the lack of knowledge part but add the whole poseur aspect since that really makes it easy to spot the obvious kooks.
eh if you ask me the kook is the guy who sits outside on a day where the waves are knee high and your just messing around with some friends and you paddle for a wave he hasent caught yet then he drops in you pull out and on the way back out he starts saying stuff about you droping in on him when he has taken every half decent wave so far