Why is 3 vs 3 such a cancer fest?

Why do people think 3 vs 3 is the mode to go if you want to be the most annoying piece of garbage in this game? Non stop afkers. Feeders. People who afk jungle longer than a Summoners Rift game would go, instant triggering once you ask for help and insult fest galore.

I enjoy playing with less people as I can study the champs more intense that way, but 3 vs 3 is a pure emotional wreckage.