We had someone matched up with us in competitive mode in Counterstrike Global Offensive who was not content with our performance and started calling us idiots and noobs, the works. We tried to get him to shut up first, then muted him.
As a consequence he started griefing our team. He repeatedly team attacked and deliberately team flashed in the spawn area, probably in an effort to get us to attack him back.
One of my friends reacted to him - unfortunately - by returning fire on being team attacked. Nothing happened then, but in a later round he wanted to flash the griefer back in spawn and hit him with the flash nade (thereby inflicting damage), whereupon he was immediately kicked from the game. It struck us as rather unfair but I guess this has to do with the way spawn protections are implemented in CS:GO.
I guess my friend was actually griefing himself when he returned the favour, so to speak, but it just seems the original griefer should have been kicked a lot earlier.
This is why I would like to know the actual rules at play here. When and where do you have to team attack and how much damage does it have to be for you to be kicked?
I would like to tag more specifically but the existing tags don't seem to be any more specific than that, and I can't create more.