That has always been the case in my experience. You won't see me in public games (without a partner that drags me in) for that very reason. The majority of the UC3 Co-op playlist community is too immature to handle having the ability to team kill, which is why I advocate
in the laziest way possible the removal of team killing from the public playlists. This would force the kiddies and other assorted losers to *gasp!*
play the game.
I mean, why do you think I have a Legacy 4 offline profile? ...besides the continued curiosity as to how that mode works... and the challenges of having to level up boosters entirely in one match... and figuring out "fun" facts about the treasure system... okay maybe I would have made it either way. >_>'