[Comrade]

Ok, I feel wise now might as well try to write something wise as well.

About the bullying. When I was in little, about 10 years old, I loved to bully others. Me and my brother often picked fights with other children in our neighborhood. When I went to school I also bullied some of my classmates (at least until one of them gave me a nice beating, that cured me of my nasty habit.)
However, I always followed a couple of rules.
1. Don't bully someone with a couple of friends behind your back.
2. DON'T BULLY GIRLS!- That's low.
3. Pick a target of your own age or much better, someone older, but leave the little one alone.

There are some things that can be deduced from these rules.
1. If someone picks on you with friends behind his back. It means, that he:
a. either feels insecure about his strength and needs backup in case something goes wrong.
b. needs someone to show off his strength to, in order to prove that he's the man.
c. is scared of you.
a&c are pretty similar, the difference is that the "C case" is less motivated to pick on you and will leave you alone much often than "A case".

How to solve this problem (sort of)?
Be aggressive, don't show that you are intimidated by the number of "enemies", don't go entirely on the defensive. For guys, if the situation resorts to a fight, hit back, as strong as you can. Of course you will be beaten bloody, when the entire "pack" jumps at you. But you will let them know, that you're not afraid of them. Very important, if the said person is picking you for the first time.
For girls, I don't think that the physical method is very popular (I'm a guy after all), my advice would be, don't remain silent. Be on "aggressive defense" (you're outnumbered after all)
A very useful method I always use is to remain polite. No matter how hard it is for yourself to be polite towards someone you don't like, smile, don't interrupt him, speak in normal volume, reply without swearwords, especially if every second word, coming from the other person is f***k, s***t or b***h. Talk, as if you are talking to a friend.
Nothing annoys the attacker, than a polite answer. By using swearwords, he is trying to provoke a similar action from you. However, if you remain calm and polite, he will start to feel like an idiot, because he is the only one who can't keep his temper.

2. I a guy is picking on a girl then he is ... I don't know what to say. Even at my school there were very few cases like this.
A guy, who is picking on you (for no apparent reason) has more problems than you. Either he is an impotent, or he has an older sister, who is bullying him. Anyway, guys like these need a specialist's help ... ASAP. No, seriously, a normal healthy guy doesn't bully girls.

3. Bully is a coward. Picking on younger people, means, that these are the only safe targets. Anyone older than his target is definitely a dangerous target.
Solution? Strike back. (I had a similar problem with a guy, who was two years older than I. Of course I lost the fight, but he left me alone after that incident.)

Of course, these assumptions are based on my past experience and thoughts. It doesn't mean, that they are foolproof.
Now, that I am older I leave others alone. In fact, now I am more of a diplomat, who tries to solve things peacefully.

... Comrade feels much better now ...