Gotcha
what do you think of a parent posting a video of his kid on a board known for dishing out shit and inviting people to "flame on"
what is the motivation there on the part of the parent?
Within the context of Coach (familiar with the board, age of son, expertise in field, etc) it's not a problem. If it was somebody else with a younger child, that's different.
As for motivation, I think it's just a proud parent showing something others might be interested in. And those who understand it, were. Those who are gimmicks, ignorant of training for athletics, or who kept making lame jokes and getting ignored, obviously were not interested.