One if the objection is that the remainder did not stay on topic, that's a fair objection (but one that I happen to disagree with). I don't subscribe to topic rigidity...if the conversation is interesting take it where it may go. The remedy is if you are uninterested, don't read or block. Others may disagree, and I do see their point. However, I note that by objecting to the drift in conversation, you yourself have now drifted the conversation. So it goes in online forums.
Two if the objection is a line drawing one (it's o.k. to criticize a player conduct for whether a foul was committed, but it's not o.k. to criticize the tactics of the team that led to the foul), that's a silly nonsensical one which has absolutely no basis in reason. I would be just as offended if some third party without authorization (I think we are all assuming the OP had the authorization to post this video) posted a video accusing my kid of a foul that wasn't called v. a tactical mistake. In fact I would be more offended by the foul (particularly if it was for a call for a card for misconduct) than a mistake (because they are kids and just learning).
I'm willing to buy the premise that we shouldn't post videos showing the errors of those under 18 unless we are the parents of said error making player. That's a completely 100% legitimate gripe. But it's either all o.k. or none of it is.