Boarders are sick. I think the people you're refering to, are the shitty gapers who have yet to learn mountain ettiquette. You just got to ask them too move. That is how they learn, and don't be a dick because you were there at one point too.
But since we are on the topic. Does anybody else hate when your skiing down a crowded run and you pull up beside or get forced to pass an avg to gaper boarder on their heel side and because they aren't looking they fuckin unpredictably turn right into you. Then that person yells at you for making them fall when they are cleary at fault for not looking before they turn. That is one of my biggest gaper pet peeve on the mountain (right after people standing on the low side of knuckles, or having a tea party on the landing in a jump line)!