Outing a person? Yin and the rest have done it as well. This video isn't a purpose to make kids like them stop playing the game. Permission? It's an online game. Their privacy is still kept within themselves. You? Obviously have a personal problem of not understanding an obvious joke. People record with gametags on for either the HD or a runthrough in ranked. Deal with it.
There's a huge difference between putting a funny description in a video and outing a person (in this case a minor)gamertag and conversation while recording them without their permission in an effort to humiliate them.
I have to ask, though. What did you want DB to do? Just not even bother playing or something?
It's a personal opinion here, but I find it disrespectful (in most cases) to not even bother trying against someone, as if to tell them you refuse to take them seriously. They didn't appear to be complete scrubs (i.e. they countered and blocked), so I'd say he should treat them the same as most any other player. Could be just me, though.
Not really. You have two stages: 1) The game 2) Aftermath
In stage 1, both you and DB played your characters in an aggressive fashion. No smack-talking/humiliating spamming; just legit play.
In stage 2, both you and DB state your amusement at the expense of your opponents having been slaughtered.
Dr. Destruction, child psychologist, recommends you teach your children early on that they're ass at most things, to prevent them from becoming little arrogant douches in the future. Remember; repeatedly beat them in everything all the time in order to reinforce that fact.