This is a general group of people I find in game who are especially bad:

Carries who were getting outfarmed by supports;

People who are disproportionaly loud compared to their ingame skill;

People who give "pro advice" while being carried;

People who brag about a win during a leaver game;

And horrible captains who draft impossible teams;

Anyone from South America, because let's face it you're terrible.

If you get an invite to this group, don't play ranked with that hero ever again.