Rosemary is not less of a dutch than Hall
The way she treated the retard guy she have for boyfriend before Hall (i forgot his name) she dind't even invite him to her party even when he offer the oportunity to that job she get in the end (to nurture kids in Somalia or something like that) and when she is in the car with Hall saying goodbye to everybody the poor guy is in front of her saying goodbye and she doesn't even look at him that is just cold and all because the dude is slow and have weird eyes
Even Rosemary have standars she reject in a very rude way her ex-boyfriend Ralph (finaly remember the guy name) very probably because she just doesnt feel atracted to him