Protocol over all else?

[Sexy Mocha]

My friend is a member of an BGLO and at the recent Jones Beach Greek Fest she ran into a member of her "brother" organization. She greeted him with a huge hug and walked away. Afterward I found out that she is not fond of this guy at all (to put it mildly)...at which point I asked her why would she hug someone she doesn't like. She responded with one word: Protocol. That word rang a bell because I was once told (by a BGLO member), that it was protocol to greet members of your brother/sister organization before GDIs. Is there any truth to this? I mean what if there's a scenario where a member of ABC fraternity walks into a room and spots his girlfriend and maybe a few cousins to the left of him and his sorors to the right? Is he to go to his sorors first because of protocol? If there's no truth to this whatsoever, please let me know.