What’s your most hated teammate behaviour?

I once had a random TTV on my squad while playing with a friend, who was playing Octane like a crackhead, after getting himself killed quickly, we ran in to grab the banner and killed the enemy squad, on the way to the beacon we were both amused and really * disturbed because the * left his mic on (he smacked it on the desk in rage) while he just went ahead and started beating his child for no reason for like 10 minutes. 

We tried to record it and thats how we learned that you can't record the voice chat on PS4.