Matt Donnelly Senior Film WriterThe horror genre loves its tropes — sets of rules that dictate survival based on stereotypes around morality, class, race, gender, and sexual preference.Much of the game in modern horror comes in examining and subverting those tropes, perhaps none so recently as notable as “Freaky,” Christopher Landon’s body-swap film that hits PVOD on Friday from Universal Pictures.Dressed up as a gory comedy, “Freaky” offers liberating and honest portraits of young women and queer people, free from tokenism and broad generalizations to which the genre can often resort.In “Freaky,” a struggling teen girl Millie (Kathryn Newton) and a menacing serial killer (Vince Vaughn) switch bodies thanks to a supernatural artifact.