Give them another 10 or 20 years and most of those kids will turn out okay.
If someone sounds like they are 12 or 14, I always cut them some lack.
Because, I remember how dumb I was 50 years ago. 
On the other hand, if the guy is actually an adult and is talking like
he's just hitting puberty, that could end up being a long term problem.
He will very likely be the guy who ends up driving one of those
pickup trucks with the giant (monster?) tires 85 miles to work everyday.