I see your point, the internet is an excellent place to kick people around in a way you wouldn't dare doing in real life, and that definitely is a way that a lot of people vent their frustrations. It's more of a problem overall (as the sum of it's parts) than it is individually, I mean, on NeoGAF you've got mods and people with tags who feel superior to others, and people bully juniors for fun and all that... forming cliques and classes and bullying people occurs pretty much everywhere, and there's not much that can be done about it, but you can bet your boots that a large part of most bullying is a self-esteem.
Now, whether making the diagram or making fun of Dax because he claims SWAT takes no skill is bullying, that's another issue for another time, I think.