Why yell at a feeder? Does it make them play better? That's like saying "I slapped this guy that was beating on this other guy". Do you both get arrested? Yes. Are you less guilty? No. Rally the rest of your team, stay positive.
The idea of you being entitled to rage at anyone at anytime in a game is honestly something I'd love a psychologist to write a book on "Why people think Internet Raging is not only Ok, but their right!"
I dont know where you got the idea that I was yelling at a feeder but youre an idiot. If someone is playing poorly or being an idiot while playing a game on the internet or a physical activity in real life where your performance is based on someone elses, I have every right to say something. Its extremely childish that Riot condones this coddling.