Many clans out there will just rent a server and use it to pub stomp, so if somebody turns up on their turf and starts laying a beat down on their precious k/d, the 'offenders' are shown the door. I figure its pretty similar to the tap on the shoulder in a Vegas casino: if you beat the house, the house throws you out. As an added benefit, their guys are usually immune to the server auto balance as to facilitate team stacking.
The worst petty tyranny I've seen personally was a clan server that "banned mortars" and "banned base rapes", but the home team would rain mortars down on us nonstop while we're pinned in respawn. If one of our guys even so much as tried to counter mortar their mortar guys, they were booted immediately but these clanners had no problem using mortars themselves. Keep in mind this was back when mortars were still over powered and three of them on Metreo could pin down an entire team if not taken care of, and going into a mortar spam fight with none of your own was suicide.
Likewise, many pub stomp clan servers these days will turn a blind eye to their own people using SMAW/RPG 9, M26 Dart or M320 grenades, but will throw a hissy fit and throw you out the moment you start firing back. They'll also have no qualms about team stacking/base raping, but God help you if you snipe one of those guys at their spawn, or you put their primma donna star negative k/d.
Server ratings. Seriously, thumbs up or thumbs down would solve 90% of this crap if getting bellow 2 out of 5 stars for 10,000 ratings yanked a server off of the Battlelog multiplayer list.