Rage escalating into infinity
Not me, but others. I keep encountering people who are already on a hair trigger temper, and the slightest, smallest, most innocuous thing will send them spiraling into a massive, blood puking, permaban worthy rage. The kind of hatred and rage that makes you angrier, which in turn makes you even angrier, and forever angrier until you basically collapse into a singularity. This has happened in almost every game today, and over things that could not have possibly affected the person in the slightest.
There's only so much reporting and blocking people can do. Seriously, you all out there need to chill the fuck out. That amount of anger is how you have a stroke at the age of 20.