Reported for verbal abuse when i never abused anyone verbaly....

So i was rengar jungle and i was up against this lee sin. I warded gromp so i knew wasn't there. Then i killed him at his wolves. After that i could predict every move he made. I warded his jungle and killed him again and again. Then he calls me a tryhard in all chat. After i killed him again i said " Tryhards lol" Then i my whole team hiding in the bush, he walks in and dies so i type 'tryhards' angain. Game is over and i get a message about being reported for verbal abuse. I literally never said anything during the game other than this.....

How can people be so stupid? Why should i build up to a chat restriction because this lee was butthurt about beating him?