If I could learn this, and I'm pretty thick with life/social lessons, then I'm pretty sure most kids could learn it. It's easy to avoid people, even in a class of 85 kids I can avoid entire groups of people that make fun of me, and, due to a scheduling quirk, I have had at least 2/3s of my classes with for the past three years. If you don't initiate or react, then they lose. It's the same concept as not "feeding the trolls".
You're committing the mistake of allowing your own personal experiences to judge what others should do, experience, or are capable of. Things aren't as simple as "if I can do it, so should other people". Circumstances and personal inclinations aren't the same across the board, and I'm willing to bet even your own circumstances are more complex than you're implying.
Also, when I say "kids", I mean younger kids as well.
In the cases it just is a online bully, the block button helps. If it's not, then that comes under bullying, and we already have people doing things against bullying. I don't think any school at this point has a policy not against bullying.
First off, even someone you only know online might know
other people you know online, and belong to the same groups, which still can pose a problem. Secondly, a lot of manipulative, dickish things can be done in such a way as to abuse someone in a manner that
discourages them from ignoring you or cutting you out from their life (I'm not going into details, but pretty much the entire concept of an abusive relationship revolves around this, and kids/early teens are VERY susceptible to that kind of manipulation).
Also, existing policies and techniques against bullying don't necessarily apply to the online world very well. Even if a school has a "no-bullying" policy, the new context/medium poses unique threats and benefits that need to be considered.
People commit suicide over tonnes of different things, and some deaths are practically suicide. It's not just cyberbullying that's a problem, I mean tonnes of kids get submitted to hospital under anorexia, drinking, wrist slitting. This problem is rather minor and something that can be stamped out online for a while, but the real life counterpart is much harder to handle.
There is no distinction between "online" and "real life". Sorry, but that's a lie.
Adults? Kids?
Take a second and skim this.
http://articles.cnn.com/2010-01-11/entertainment/avatar.movie.blues_1_pandora-depressed-posts?_s=PM:SHOWBIZ
People get suicidal over CGI puppy-eyed elves.
A single mid-sized webforum of nutjobs does not imply a greater social problem at work. No matter what strange niche group or psychological delusion/problem you think of, you'll be able to find some group of them on the Internet, no matter how poorly they represent society as a whole or how much of a minority they are.