The main reasons for lag aren't "the damn laggers".Its the server connection, your connection and of course amount of players.Although I ain't a expert in this I can tell you how to vote kick ppl off:First turn console on from Adv. Options: Secondly write this to console by pressin the button below esc:
callvote kick playername
Personally I use it for sendin hints to livin ppl when i am dead in Objective matches for example U should try too

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I can't figure anything good on this section