Josh, you may not realize that you sound like you're going on an unwarranted attack when you tell people their skiing sucks when you haven't even seen it, and when they didn't ask for your opinion (your two posts above to Bill Talbot and oldschoolskier).
You are concluding they are guilty until proven innocent when you ask them to prove they are with video. UnAmerican!
You might consider saying that doing those specific things with poles, in your experience, leads to specific problems, without pointing out who you are talking about, without telling them their skiing is suffering, and without asking for video from them to prove it isn't.
In other words, there's a way to share your information and experience while keeping it non-personal. Rule #1.