Mastery spam, laughing/ taunts etc.

I've been playing league for a fair amount of time: enough to understand a majority of its concepts. I play League almost solely because my friends do because that seems to be the only positive thing that occurs. Its almost like Riot promotes toxic behavior in the community ie. making it where Vlad will laugh when he pools or when singed flips an opponent. Well if that is not convincing enough think about the idea of mastery spam, laugh spam, taunt etc.... Is it an attempt to add individuality to champions? I believe it is but that won't stop people from "abusing" emotes in order to tilt others. Everyone who has played League for any substantial amount of time has come across the Blitz who spams laugh when you make any mistake in lane or the Nunu who consumes your entire jungle and spams laugh in your face. I believe this is easily fix of course: either make it so when you mute the player you mute the champion as well or you could assign a cost to emote ie. every time you laugh it cost 20 mana or other resources so that people can use it but it gives them an incentive to do it less.