Can players get banned for things said in post-game/stats screen?

Basically just had a guy start calling us pathetic sacks of s**t and telling us to go kill ourselves in post-game, but he didn't specifically say those things in game. I reported him and he may have been penalized already, I'm not really sure (I received an add after, I think it was from him because he wanted to prove he WOULDN'T get banned, but I couldn't see a name). So I'm just curious, does Riot pay attention to reports sent for things said in post-game screen? This guy seemed to think that they don't. Here were his parting words before he left the room:

"now if you'll excuse me please go kill yourselves while i enjoy the rest of the season without getting banned or penalized in the slightest becuase riots not going to ban me you should probably have not played league or at least stopped living idk idc either works for me XD"