A class? A subclass? A certain mechanic? For me, it's my teammates. I've been knocked into sniper lanes. I've been hit by grenades, bullets, and supers aimed at my teammates. I've been unable to go invis from Stalker, because they keep pushing me as they run. I've had them ruin my off-the-radar invis by standing on top of me. One time, a guy missed heavy, blamed me (I wasn't the one who picked it up), and proceeded to punch me for like five minutes while I tried to fight the enemy. I thought about making a video covering this stuff, but the salt is too much. I'd have a heart attack.