One morning before you arrive at work, junior dev Fred -- a nice kid, but definitely junior -- gets ahold of the server and starts monkeying around. It's not his job. It's not his server. And now you're either going to have to wipe the server and start fresh or get a debrief about what he has and has not done. And Fred's junior, as noted, so he doesn't always know the best way to do things (although, like many junior developers, he sure thinks he does!). So now you, senior dev, have this wild card that you just don't want to deal with because you're busy and doesn't Fred have other tasks on his plate? Why is he jumping all over your damned server?
So you snap at Fred. "Get away from that -- it's mine, not yours. Please do your job and leave me to mine."
Doesn't seem out of line to me.