Should i fight this person?

Okay so there is this guy in my high school that i just really hate. half the school literally hates him for three reasons. He is rude and annoying, He has a large ego and thinks he knows everything, and finally, he blames everyone around him when he makes a mistake. I met him when I was a soppre. He was a freshman, but I never bought into the whole "freshman suck" thing. I became friends with that guy, then he became incredibly annoying. He saw that I was in a lower math than him and made fun of that. I didnt mind at first, but he started making fun of the fact that I was an asian in a lower math than him, and that I worship a god. I told him to ease off, but he just doesent know when to stop. In my engineering cl(im in a special academy school), we had to design a tool slide for a machine. He claims he is terrible at drawing, and cannot put things together by hand. I felt sorry for him so I helped the guy out, and its only because of me he ped that cl. he needed to catch up on homework, and I gave him mine. He then went on about how Im stupid, and one day, he found out I have poor vision in the darkness. He said to me, "so Jeremy, you're legally blind right?" I said yes, and he said "oh, well I can SEE that you cant do things like normal people. you're disabled and therefore are useless to society." I couldnt deny it anymore, I've been very patient with this jack, and if he is willing to kick his own friend like that, perhaps his only friend in that cl, I didnt want to be his friend anymore. I told him to leave me alone, and he never did. other people told him to shut up and leave them alone, but he continued anyway. there was this one girl he knew and he liked. he tried to make a move, but ended up being stupid. he said "hey, you and me should be boyfriend and girlfriend". she said "I barely know you dude, and I think you're annoying". He said "do't worry, I'm good in the sheets". She walked away and later asked how I could be patient with someone like that. I said I wasnt sure, then after a few weeks of talking, she became my friend, and it only pissed the guy off. this year, my junior year, he became ten times the jack he normally is. he punched this guy in the back of the head to be funny, then the guy turned around, bunched him in the throat, pinned him up against the wall and told him to **** off. the little never messed with that guy again, and the teacher didnt care and said "David, you had that coming to you." I then realized if you attack him, he backs away. I decided later it would do nothing, but in the bus ride home,he made fun of the fact my grandma died. Later he ran up, sat on my lap as i slept and farted. I pushed the mofo on the floor and was about to punch him in the face, but the bus driver pulled me off fast enough. he made me sit in the back, and the whole time he was flicking me off and saying things like "so jeremy, you're grandma died like a *****, hahahahahahahahhaa". My grandma was very close to me and I lived with her since I was 1 and she died weeks before. I pity that his parents mistreats him sometimes, but when I met his mom at the open house, I realized he was just being rebellious. I want to kick his ***. I want to beat him into nothingness. the problem is tho, when someone steps up, he runs crying to the teacher or principal. there are no cameras in the bathroom, so I plan to beat him up0 there. He thinks he can beat me up, but he is incredibly weak and I know judo. I know it is wron, but I REALLY wnat to. what should I do. he does this to other people too