"Why report him? He's carrying you"
Okay, look. This is not an excuse. I see so many times that someone is being an ass to their team in chat and then someone asks someone on the enemy team to report them after the game and as soon as you say it you get a comment like, "But you're the one that sucks" or "They're carrying your whole team why report them?"
Whether someone should be reported isn't based on whether they are really good at the game, there's a reason we don't have "unskilled player" as one of our report options anymore. I don't care if you decide to report them or not because not knowing what the enemy is actually saying means you don't know for sure but don't make these excuses that by being good at the game someone should be able to treat others like dirt.