There are fourteen-year-olds who have a level of reasoning and intelligence that they really ought to be able to make adult decisions and have adult responsibilities. Likewise, there are eighteen-year-olds who are accidents waiting to happen, and twenty-, thirty- (et al.) year olds who make me cringe at the idea that they're allowed behind the wheel of a vehicle or permitted an equal voice in electing our leaders.
That said... Fourteen-year-olds. Specifically, fourteen-year-old males, because let's face it, no one is envisioning a fourteen-year-old girl shrieking obscenities into their headset microphone.
In the United States, being fourteen means that you are about to or have just emerged from junior high school, a place many equate with one of the lower circles of hell, only harder to escape and with less pleasant company. You have testosterone flowing through your body and very few socially acceptable ways to deal with it, from either an aggression or a sexual standpoint. You're getting past the trust and lack of judgement of childhood, but you probably don't have quite the reasoning powers and perspective of an adult, so mostly you just have a lot of insecurity from that misplaced childhood trust and a lot of frustration that adults don't take your point of view all that seriously. Power of all sorts is just out of reach: driving, sex, earning a decent wage, going to restricted movies. You probably have just enough responsibility to be burdensome (look after younger siblings, do "adult" chores, maintain that GPA so you have a chance of getting scholarships) but not enough to make you feel trusted, or any that comes with anything like prestige.
In short, fourteen sucks. Big time. And fourteen becomes a scapegoatable age because many fourteen year olds, especially fourteen-year-old boys, will take out the fact that fourteen sucks on anyone they can given half a chance. Forums and video games are perfect for this: a place where your word is as good as anyone's (until you shoot your mouth off in favor of some indefensible point, badly), a place where twitch reflexes may count for more than reasoning, and best of all, a place of relative annonymity. No dealing with anyone who remembers you in Superman pajamas, no rationalizing yourself to someone who knows you snuck into the liquor cabinet when you were twelve and made yourself sick.
So, yes, there is a fairly recognizable behavior pattern that will make many people say: Oh look, a fourteen year old boy. If you happen to be at our near that demographic, realizing that said behavior is recognizable and not particularly celebrated might not be a bad thing. For the rest of us, it's good to remember how much being fourteen sucks for most people and have a little patience. A lot of people are perfectly worthwhile human beings at fourteen. And most of the rest will become so after they get through all of that crap.
