I was bullied at school as well, and yes I hated it, but its in my past now. Of course, it is still an issue for a lot of young people and is a matter that should be taken very seriously.
But as a person who frequently uses the internet (for both work and leisure), I am still prone to cyber attacks from complete strangers, and I still see a lot of cyber disbutes going on, and it's very disturbing. You join an online community to chat with people who have similar interests to you, whether it's a video game or movie or TV show or muscian, and you end up having petty disputes which can get really ugly.
I think one of the differences is, that physical and verbal disputes happen in real time, and if someone in the same room is bothering you, you have a chance to fight back and take them by surprise and they may even learn their lesson and back off. With online disputes, if someone aims a nasty comment at you and you make a comment back, they have time to compose themselves and analyse what you've said and twist it around so they can type up an even nastier response, and it can just go on and on.
And you can become a troll or cyber bully without even realising it. I've typed nasty messages to people before, but I wouldn't know if I've really upset them because I'm not faced with the person or looking them in the eye, I'm just looking at a screen with text all over it. I had to remind myself - that's not me, I wouldn't treat people like that in person, so i have no right to become a cyber bully to someone.