This many be trite but really, were they really friends of frenimies? It’s seems like slag, babble after a few drinks, familiar talk since “she said it all the time”. In this most cursory examination. Maybe the birthday girl had a few too many and the emotion of the moment overcame her. I can’t imaging any world that I would disown or even get angry at a mode of speech. Sound like they should both become as passionate about real world concerns as they were over a mis-speak. She sounds petty if not truly self absorbed. No judgment, simply my unprofessional analysis.