Okay to say offensive stuff?

So I was watching some youtuber/streamer Yassuo and in his most recent video he called someone "retarded" on the EUW servers, I don't care what people say in my games a long as it's not spam but was wondering if he's accountable to a punishment? Because it fails under hate speech, unless his status in the community gives him immunity :/

Edit: I forgot to change the boards option sry about that oops