Riot is fine with this behaviour
My previous post was removed for "personal attack" therefore I covered the names in this one.
This guy (Zed) was reported after the game. He didn't get any punishment. I submitted a ticket to Riot and asked them to take a look at his case. My ticket got closed as "solved" after I got a pre-written message that essentially told me they don't care.
If you call a boosted player who makes you lose the game a "boosted bronze noob" you will get banned for toxicity, rank shaming, etc. However, if you wish cancer and death to someone and his familiy multiple times it is perfectly fine, it isn't even worth a chat restriction. Telling someone that "I **** your dead mother" is just fine. Well, good to know.
[zombie-brand-clap]