I seriously hate it when people come into you or your friends game and act like they own the server. THEY DONT!!!! I make servs for my friends just to have fun but when somebody comes in and acts like they own it, BACK OFF!!!
Problem solved, man. The way I see it, why let assholes ruin your mood? You're the one in control of your emotions. Remove them from your life and stay positive.
Alright I'm closing this, a couple of the options above would help though. /maxclients, /ban add, /password, and /minbelt will all help ward off pesky interlopers.
Present to me the most beautiful woman, and I shall reward you with chronos