Yea you'll get that from time to time mostly by mistake when you catch a team mate off guard or your name doesn't appear above your head fast enough.

I even had some ****** on my team spawn just after i did and I was setting up my care package on Wasteland. As soon as it dropped and he saw it was a Chopper Gunner he shot me and stole my shit! I team killed him the rest of the match and flash banged him repeatedly.

It's the same for Xbox but I believe there is some method of the game knowing if it were accident or on purpose. For instance if you team kill someone at the start of the match when you're all together, you'll die. But if you're all in a gun battle and your team mate just happens to run through your line of fire.....you'll still kill him and get points deducted but it won't be redirected back to you.