Warning. Wall of text incoming. You have been warned.
---
Dude.
In the past, if you were getting bullied you COULD settle it with fisticuffs since a) kids were in better shape, since they played outside and stuff b) Bullies respected fighting back more and c) if you got into a fight with bullies, the school admins would be more like "Ah, good show young man! You stood up for yourself like a real man!".
Nowadays, most of the kids being picked on are physically weaker, school admins are apt to go "OMG YOU FOUGHT BACK?!?!? NO FIGHTING!!! EXPEL!!! EXPEL!!!!!!!!!!", and unless you fight back and scare the bully away right away, they will not be happy if you try to stand up for yourself once they've gotten used to picking on you and they might resort to more insidious bullying behind your back or they could get a gang of their buddies together to get payback.
Also, not all kids are fighters. I'm a pacifist. I don't like pain. I know it hurts. So I don't like to cause it to others because I know it sucks. It's an inborn thing for me. I'm just not a fighter. Does that mean I deserve to get picked on, since I'm too naturally kindhearted to fight back and hurt others?
And unless you have a bunch of truly loyal friends already, bullies will typically try to isolate you and make it much harder to make any friends and thus gain strength from them. They will try to make the whole school believe you are some loser that no one should care about, and then next thing you know, you'll have no one to watch your back as the bullies and their friends all gang up on you. Not to mention how EASY it is in a high school situation (read, a circus of monkeys) to blacklist someone. The victim is a boy? The bully and all his friends can spread rumors he's gay. The victim is a girl? Spread rumors she's a slut. Spread it wide and insidiously enough and BAM, instant social outcast as now the entire school believes it and the victim is now stuck with a hurtful label they can never get rid of which will make it REALLY easy to pick on them.
And then if the victim finally has enough and finally snaps and fights back, they'll get expelled for fighting, even though the bullies goaded them into doing it.
The worst part is the isolation. Believing the entire school hates you and wants nothing to do with you. I had half the school on my case, and I had guys YOUNGER THAN ME picking on me and spouting the same stupid BS that the main bullies were. It took me 3 years to make TWO friends. And the grand total of 2 friends I had were also major outcasts. One was a former crybaby who turned psycho and everyone was now scared of him, and the other was another "too nice" guy (Who eventually became a douche later on).
Bullying has been getting more and more insidious and nasty over the years, OP. This isn't some jocks shoving nerds around, where the solution is to "man up" (God I hate that phrase) and punch them back. This is full on social warfare and isolation, backed up by threats of violence, where fighting back will either incite more violence, or get the real victim expelled. Unless the school is really cool and will let things slide with just a suspension, and the victim counterattacks hard enough that he sends the message of "fuck with me and YOU WILL GET REALLY FUCKING HURT" (Like the casey incident) fighting back is just going to screw the victim more. And just "standing up four yourself"? Pfft, sure, just as long as nasty rumors haven't already begun to circulate. If that's the case, you are screwed and no amount of "standing up for yourself" will make the school stop thinking you are a loser of some kind.
I was isolated, mocked, shoved around, attacked in gym glass (being tackled when the teacher wasn't looking, getting passed the basketball by having it thrown at the back of my head, etc), shoved into a staircase railing incredibly hard, and a bunch of other shit I have since repressed for five fucking years. And the perpetrators only got any kind of punishment for it in my last year, excepting the main bully, who was the nephew of the VP of discipline and he got off scott free. I still have lingering issues. I have more or less forgiven most of the idiots due to them being...well, idiots. But that main bully? If I saw his grave and no one was watching, I would probably piss on it.
So yes, OP, bullying is s serious issue. I'm glad you found a way out. I didn't. Others can't. Bullying sucks and it needs to be stopped. It is social warfare backed by threats of assault. That shit ain't tolerated in the adult world, why should kids be allowed to do it?
Edit: GOD I hate topics like this. It brings back all the bad memories. I am literally shaking with anger right now.
Edit 2: *plays a round of Unreal to vent his rage*...Aaahh....that's better.