as mentioned a couple of times, but will reiterate;
1. people running into your board in the lift lines without apologising, and continuing to do so. especially when most of the ones doing this have rental gear so they don't give a shit.
2. people pushing in lines, had one lady do this to me in NZ this season and knew that i caught her but she didn't give a shit. got hell annoyed at this.
3. skiers that hit your gear with their stocks and who maintain that whole skier superiority bullshit (witnessed first hand in canada once, wont go into the story)