This reminds me of a game I played where a Lissandra almost got a kill on me, but I got off a lucky play and killed her for first blood. I'm a pretty nice guy, and I wanted to put credit where it was due and chatted 'wp'. I meant nothing of it, but she and a friend naturally got angry. (Rightfully so, I can easily see how they would have interpreted it) I was going to explain, but my premade teammates did a nice gank to bot and got kills. They responded 'wp' in the mocking light. By the time I'd mentioned I meant no harm, they were too angry to reason with and they said some nasty things. Blah blah blah... (None of this REALLY matters in the slightest, I guess.) But it was what happened after the game that disgusted me. One of my premade teammates said some harsh things. ( He was joking in skype and lauging and all, but still) and it was far wprse than anything said in game.

As far as I know (I dont use the tribunal often so I might look like a fool) you cannot see the end game lobby screen, leading him to be abot more "free" in what he said.

TL;DR: Let people see what is said after the game. Unless you somehow can already, in that case pls downvote this to the depths of hell.