LOL I was in that game on that guy's team. He was an Oak right? I wasn't the one who said the stuff about the third world country or no education or whatever, but I did call him a retard because he was beyond epic fail, he would literally throw himself at the enemy towers and demigods randomly without any forethought whatsoever. At first, it started off with a simple "wtf dont fight 1v3" but he didnt care, he made no attempt whatsoever to run away and escape and fought 1v3 and got raped time and time again, and that kind of stuff is just frustrating.
You have to take into account that games with tons of issues will see more insults generally because people's moods get soured after waiting a long time to get a game going only to have ppl drop, feeders etc.
Also, in our defence, the guy was insulting us too, except he was doing it in allied chat while the other guy was doing it in all chat. His excuse for fighting 1v3 was "u gotta fight and not be a pussy".