While it adds something to the atmosphere to 'hire security' for an event, it should ultimately fall to the event organizers to police their events... and not just by ICly telling the security RP'ers to "take care of it" and then going back to their party without a care. They need to periodically announce OOCly that there is security/bouncers in circulation, identify them, and impress and that their directions need to be followed. They also need to back up the security/bouncers when they have to 'correct' disruptive behaviour and organizers most certainly need to be directly involved (even if it's in a strictly OOC fashion) when someone is being expelled.
Otherwise, a hired security/bouncer PC just appears to be a self-appointed vigilante at a party looking to ICly spoil someone else's good time.
Now... if a disruptive PC -still- doesn't take the hint from IC RP with security/bouncers and OOC communication from the event organizers and refuse to leave... then that's an issue with the player, not with their RP. Nothing you can really do about that, unfortunately.
Otherwise, a hired security/bouncer PC just appears to be a self-appointed vigilante at a party looking to ICly spoil someone else's good time.
Now... if a disruptive PC -still- doesn't take the hint from IC RP with security/bouncers and OOC communication from the event organizers and refuse to leave... then that's an issue with the player, not with their RP. Nothing you can really do about that, unfortunately.