Dude..its a meet in a public place. The only way to control whos there is to walk right up to the undesirable people and tell them to leave...so next meet go ahead, sack up, quit talking smack on the internet and kick out the "douchebags".

EDIT: Im not actually advocating kicking anyone out...Id just like to see if hes got enough sack to talk in person like he does online.