Sam Harris is Wrong About Morality (It Can't Be Objective),
Tho posted before, here is Part 1
Morality Can't Be Objective, Even If God Exists (Morality p.1), CosmicSkeptic
"Is morality objective?" is the wrong question, because it assumes it's externally bestowed or at least defined. Morality is a work product of society. It's a rough and constantly-evolving consensus about what sustainably promotes the kind of society most of its members want. In most societies that's some form of civil society where the "pursuit of happiness" is maximized and the harm of others is minimized via civility.
I'm hard of hearing so couldn't really hear the kid's points but from watching a whole lot of debates on morality it's usually just a matter of how people define objective. I define objective as universally accepted by the social order. Christians try to make it some rule out there in the ether written by god without really saying how that is even possible. If the video makes a better point I'm sure it will be pointed out by folks that could actually hear the "CosmicSkeptic."