the best that is to be expected is that he's searching for his fifteen seconds of Internet fame (shorter attention spans have eroded the former 15 minutes). In pretty well all of those scenarios it is unlikely that he'll read or listen to any comments
Since I'm at work, where I have A/C but not Youtube access, I'm currently in the mood to assume the best, so I figured I'd comment on the one thing I can actually see in an attempt to help him.
Since it's youtube, at least the initial link should be safe. If his video's entertaining, there's no need to worry about it. If it's bad, I'm sure someone who can watch it will let him know. In scathing detail. If it's pointless, well, rate downs will tell. And if it's gold spam or something worse, then I'm sure someone will report it. So, for now, why worry? It's not like it's one of those jackholes from Denver.