This is all besides the point. At a skating competition, the audience is told not to distract the skater during the performance, not to use flash photography, etc. We don't know the motivation or the identity of the person who was rinkside making gestures, but he was right by the rink where Yuna was skating and he was making a gesture that would draw attention to himself. Completely inappropriate.
He most certainly was not cheering her on.
As for drawing attention to himself and thus not having respect for Yuna, that's possible. He may have seen the camera and wanted to garner some attention. That's definitely more likely than him trying to curse her on screen in the middle of her performance.
Coaches have been known to flamboyantly jump and scream when skaters land jumps in that very area
If you admit you don't know the motivation of that person, I don't believe you have any evidence to conclude he was NOT cheering her on. You're entitled to your opinion, but it's just that.
I don't agree that it was a "macabre plot", but I do think for as many examples you come up with this sign being used in a positive way elsewhere in the world, it's not going to change that for some, this sign--and the context in which it was used here--is not seen as a positive gesture. And I think that's a valid point of view.
Coaches cheering on and supporting their skaters is fine. When Tomas Verner was bombing at 2013 Worlds, his coach rinkside was nearby shouting, "Come on, Tommy!" But that's not what happened here. The person in question is not Yuna's coach.
I don't know what skating competitions you've been to, but screaming/yelling, waving of "big things", usually occurs when the skater is announced and when the skater has finished. Applause happens during the performance when the audience appreciates a skater's execution of some element (jumps, footwork, spins). There usually is some kind of reaction after a skater makes a mistake--gasp, sympathy applause, etc.There is plenty of screaming, yelling, applause, waiving of things - BIG things - and gestures AND photography of all kinds going on, routinely, at every single skating competition - all of it arguably distracting to skaters. It's not an exceptional occurrence, it's completely routine.
The above actions you list don't all happen throughout a skater's performance. And arena announcers do ask the audience not to use flash photography, not to throw unwrapped flowers on the ice, etc. For the most part, the audience does obey these rules. They typically do NOT behave in a way that would endanger or distract the skater during the performance. That's a perfectly reasonable expectation of the audience. Those rinkside should be held to the same and even higher standard.
You think it can't be concluded that he wasn't cheering her on? I think we're done here.If you admit you don't know the motivation of that person, I don't believe you have any evidence to conclude he was NOT cheering her on. You're entitled to your opinion, but it's just that.