Yeah, she seems to be a different kind of asshole (unless she's responding verbally with this kind of body-shaming, in which case they're definitely both being rude and nasty). If her spouse is adamant enough about going on a nudist vacation together that she's already contemplated divorce, and she can't respond other than by body-shaming but also can't contemplate separate vacations, perhaps a marriage counselor would be closer to what she really wants.