Parfait feels like the embodiment of "fool me once, shame on you; fool me twice, shame on me", except she keeps getting fooled...over... and over... that says a lot more about her than Soda, that's for sure, though. She might be right that her meaness is frankly because Soda is part of the hierarchy system that is so ingrained in her head, because all Parfait wanted was being friends with her half-sister despite... everything, really.