As someone pointed out a still frame is different from video. The video of much doing it repeadately is super creepy. I mean I stretch by raising one arm and holding it with the other behind my neck. If you catch a picture at just the right time it might look like im doing it but a video of my activity makes it more clear. Even given that the still from your link is clearly a wave. His arm is bents. Its not straight. It looks nothing like a nazi salute other than he has his arm raised. I have waved with both my left and right hand. Its honestly just the right trying to make false equivalencies.