This would work against players who don’t think outside the box. If you have another friend in game who sees this happening they can also spectate and gather appropriate evidence. You could also try contacting an admin. There’s are plenty of ways to do so without retaliating by breaking the rules. Whether it be through these forums. Through the steam admin group. The steam forums, or to one of them on steam direct. If they’re all offline you could try to be the bigger man and switch servers.
If a moderator comes in and sees someone intentionally team killing they will of course warn the player. Then followed by a kick and then bans for repeat offences. Rules are rules. If you team kill repeatedly and choose to ignore the rules, you dug your own hole. So go sleep in it.
Are you complaining because you got banned for breaking the rules? I don’t get the point you’re trying to get across here.