Well here's the thing, I think some of you are putting in what you'd be in real life rather than if you were in the Bullworth world.
The bullies aren't technically bullies when compared to the rest of the school. They are more like layabouts or bludgers or whatever the American equivalent is. Yeah, they bully non clique students, but so does everyone else. In terms of the storyline they don't seem to care too much about anything other than having a good time. I guess because they are the only clique who saw through Gary's obvious BS (or more likely didn't give a damn) and remained loyal to Jimmy that has a bit of an impact on my opinion.
I think the biggest factor in why the bullies aren't usual bullies is that they typically side with whoever has got power or appears to have power and Jimmy certainly didn't have it at that point in the story and I don't mean physical power like Russell has, I mean influence and popularity.
Frankly the nerds aren't the standard nerds in real life either. They are backstabbing scum and far more aggressive than most nerds and probably a big part of the reason they are picked on. It's not exactly like they can't fight back if they are armed. They aren't exactly intelligent either.
Some of the clique do fill the stereotypical role such as Bucky, Fatty and Cornelius but others like Algernon, Donald and obviously Earnest do not fill this at all and those have more power in the clique. Nerds tend to stick by those who have treated them well (because they generally have difficulty acquiring friends outside their social circle and hell even inside their social circle) and they did the exact opposite.
Having said all that, the Townies fit me the most. Despite constantly being told I was intelligent, school was pretty horrible for me because of all the social nonsense and I had to drop out. I identify with Duncan and Jerry pretty strongly.