For me it's definitely people that never even use their primary weapon once, but just run around and shotgun melee the entire game.
I don't know, what do you guys think? If you have something else that you rage at in crucible, make sure to post it down below and I'll be sure to check it out!
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Other than blink/shorty and thorn. The most annoying thing is sniping someone in the head or unloading a full clip on some1 and they don't die bc of lag, and then that person kills u. Worst shit ever!