Same reason why the english hated the Viking raiders during the age of the Vikings. The Norsemen needed to be exterminated for seducing english women with such fancy concepts as personal grooming and washing more than once a month.
The "prince" got cucked into oblivion and it is his own fault. The "heroine" got fucked into oblivion and is gunning for more.
The "villainess" won, so hard. Like, god damn!