Seriously about every 2 games I'll get a really bad player who will do stupid plays feed the enemy team and when you ask him to play safe or to stop ganking or to group for teamfight the response is
"SHUT UP OR I FEED"
"SHUT UP OR I AFK"
Of course people aren't going to shut up and they will taunt you if you respond like this even if they are on your team, if you act like a tw@t expect to be treated like one.
I report these players but they are still playing games and have done it multiple times, I checked their match history(you can tell by dmg dealt to champions being under 5k in a 30min game)....