Question on kill Steals

[Robotic Pope]

I don't mind people taking my kills in team battle, I might say something like "Awww you steal my kill" but I only say it jokingly.
What does piss me off is the numpties on my team that try to shoot the guy that i'm behind while they are behind me. I get a big dose of friendly fire and can't fly anymore and then my so called "team mate" moves in on my kill.