I like the idea, sorta, but harshly stated. Shitty people should be allowed to ski in the park, on the condition they try. I suck. Nobody has a problem with me in the park because when I hit something I hit it the way it was intended or keep my ass off it. If your not hitting it the ways its supposed to be hit, get the fuck out. Its the same with your park rat comment, let em go up there if they are educated enough not to get killed, have the right equipment, etc.
At our hill we have a bell to ring if you get our 80 foot rail. On weekends the gaper racer kids ring it for shits and giggles. I've never yelled fuck you so loud or so often in my life, but if they hear you the get the idea.