Ohhh, its quite bad on the east as well! I know several spots that if you show up on a decent day and dont show any respect, you will not get ANY waves!!
I've even seen many people's windshields get waxed, tires slashed, etc. etc. etc...
I guess its hard to understand why they're such assholes unless you actually experience what they do: go out in 5 degree (air) 32 (water), LIVE there, surf there all the time, etc etc. Next thing you know its summer time and 100+ tourists show up and act like they own the place: snake, drop ins, ditch boards, paddle into lineups, speed through backroads, litter, etc etc and the list goes on..
I still dont think its an excuse to act like an ass, but i guess some people get fed up with it.