I have never seen behavior like that before, much less the stuff in the video. If I was the parent, I would be mortified - the more so that it made it to the Internet. If one of my children actually kicked you...
From what I remember, the little girl’s mother wasn’t watching her very well, per the many times the girl strayed from her mother’s side (and view) while they were in line. I know it’s fairly boring for a child that age, but pu-leeze!—kiddo—don’t use it as an excuse to attack someone!
:(