Handling players that disrupt the game

It depends also on the server you are on, regarding how easy it is to deal with deconners, bleeders, troublemakers.
If you can't kick the troublemakers by nickname, use the command
 !listplayers
and then after you see a number(ID) next to the playername type
 /callvote kick <ID> <reason>
You can callvote kick regardless of how many different colors their nicks have.