First, send an ingame report against that player stating that they are team killling you. Then kill them back over and over again yourself. Just keep in mind that if you kill them 4 (I believe it's 4) times you will get a 5 minute ban. That means for 5 minutes you can not play or use world chat. Sometimes it's worth the 5 minutes to kill these players.
Another thing you can do is ask the red team to take care of the player. If there is an experienced player on the red team they will know what to do. It's called a "pass". Tell them they have a free pass and explain to all in the game not to shoot at that red player. What the "pass" means is that no one shoots at that red player and in return he/she will go after that team killer only. This player will not shoot at anyone else or bomb your hangers so you all have nothing to worry about, except the team killer. This usually drives that team killer out of the game.
Also use the "pass" against a player that is taking out your own hangers.
Another option is to do nothing at all. If the team killer kills 4 times he will eventually get that 5 minute ban and be booted from the game.
Last option is that you can leave the game yourself if you find this player to be annoying. Believe me, killing him back is more fun!
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