The impression I got from this was a mom vid taped her son performing. It is obvious he had done this many times, he has the whole routine down. The mom was prolly trying to get it on tape for some time because it is cute.
Why the mom yelled and scared the helly outta the kid I dunno.
I do not however think the mom posted the vid or made the comment about death, someone else did.
I have two daughters and a son, my son being the baby. Growing up with his sisters and I in the house and all our girly things must be interesting indeed and my son has done many things along the way, many of which I wished I had gotten on vid tape lol, nothing I would ever post publicly - that's just cruel IMHO.