Do players, who intentionally feed, actually get punished?

Last game, I had a Thresh who ran into their team constantly. His final score was 1/17. He explained, after the game, that he only fed because our team questioned why he went into their jungle 1v3ing. He then proceeded to say, "Next time, don't ask why or else I'll feed." There was another Ashe on the enemy team who was defending him and started using racial slurs, but reported her under verbal abuse and etc.

I understand Riot punishes players who are toxic and uses racial slurs, but do they actually look into those who intentionally feed?