Chargers... if getting shot knocks me out of my zoom, then shooting someone charging should knock them out of it too instead of running through your bullets.
Teammates that run and stop in front of you. In swat there's no betrayals, so it really messes you up when you're shooting someone on the other team and your teammate runs in front of you blocking your bullet. Or you try to go somewhere and they get in your way and you're killed as a result cause your teammate was blocking your path.
Assassination thieves. That -Yoink- on your team that watches you perform the assassination then steals it by melee attack. Sure the team still gets the point, but I'm also working on my assassination commendation. Worst of all, because it's swat I can't betray that -Yoink- because at that point I don't care about killing the other team I just want to kill that guy.
Aside from quitters... thanks for the recent 2 on 4 swat match... if half your team quits you shouldn't be banned for quitting too... idlers or just plan -Yoink- players who should quit but don't. 7 kills and 23 deaths and 1 suicide... just quit, stop -Yoinking!- it up for the rest of us.