I got bullied a few times when I was growing up, the first time was a non-issue I must have been 9-10 years old, I had been taking Karate lessons and I lashed back and found that I was strong, i got suspended for a few days, afterwards me and the guy got on fine.
Then again during lower comprehensive school (new school, new people and some guys hit puberty faster than others ^^), a group of guys (2 main guys) of which I had been friends with when I was younger for a short time, for some reason decided they were "after" me. They were older than me and it wasn't exactly a fun situation. I remember being punched in the face by one guy in school as he asked me if it hurt, and I would reply no, to which he would just punch me again. Then I remember it was 2 days before I was due to go to france, I was 12 years old and in the middle of town 3 of the guys were there and one punched me in the lip (Fat lip like a badboy) and I (My parents) went to the police about it, soon after it stopped, one of the guys then (quite sly to be honest) started acting nice towards me.
A few years later I was into skateboarding and I saw the guy that punched me and he had simply grown up, he was so ashamed of himself and appolagised often, infact if I see him now (some 13 years later) he is one of the nicest guys you could know and we get on great.
Another time during my age of 13-14 I got bullied by some guy, nothing too bad but it wasnt fun being punched or pushed around and I snapped and attacked him eventually, after that he was generally nice to me. In that case he was a much bigger guy, I genuinely had no chance of beating him in a fight but bullies often get put off by someone who shows confidence or courage, they prey on the weak.
About the guy in the video, he was right to do what he did. But I think his parents taught him wrong. Telling your child "not to hit" people is all well and good, but sticking up for yourself is something that everybody at some point in their lives will have to do, and I think that a child should know that self defense is ok. Bullies pray on the weak, and a kid who doesnt defend himself and will just allow someone to hit him is a prime target for a bully. I guess its not always that simple though.