Permabanned. For joking around with a friend.

Hi everyone. So I enjoy playing league a lot, especially with friends. However in one game, I decided to joke with my friend, Blitz and just make fun of him. He was fine with it and he laughed at it too, we were just messing around and having fun. I swore a lot though, it was directed towards him, and only him. Then, our vayne flames me for being 9/3 and being unable to carry. I told her I can't carry a 5/6 top or a 4/5 jungler. I also said Tristana isn't a hyper carry and that she is ignorant as sh**. All this happened in only the last 7 minutes of the game. At the end of the game, I was permabanned. It only showed me two games on my account and one game on my email(the one with my friend). I don't see how joking around is bad. Riots System just detects bad words and automatically bans you. I've been banned once for 14 days(completely deserved) my account and it was last year. I have not been reported for the past 3 months. It's just that I mess around too much when I play with friends. I also attached a screenshot of the 2nd game. I don't really see what's so toxic about it other than saying "kayle should lose ^.^" and quoting Kayle. But again, the system only detects bad words and I have no words for this but I really hope my account is retrieved.