You literally spend the entire game verbally abusing and harassing another player. Not only that but you use allot of racial slurs and heck, even the very first line of chat contains one. I get that you were mad that he banned your champion in champ select but his actions don't excuse your own. Not only that but was it really worth it spending the entire game full of hatred and anger and ultimately losing your account because of it?
Even without the racial slurs (which are zero-tolerance policy by the way) this is still punish worthy, so no excuses. It's unfortunate that you got permabanned but by your own admission this isn't the first time you've received a punishment so you should have already known that poor behavior (especially behavior of this kind) will not be tolerated here. Ultimately you have no one to blame but yourself here for this, and if you truly valued your account (and your ability to play with your friend) then you should have thought of that before you decided to act up.
Next time this kind of situation happens just suck it up, report if need be and move on instead of devoting your game time to go on a hate-filled tirade against someone else, as otherwise you may very well find yourself back here again. To quote Baron Barian:
There's trash talking, and then there's talking like trash. Don't think twice before you talk. Think 5 times.