Alex turner dislike the supernatural especially the vampires, you wanna know the reason why he hates them so much? It's cliche but obviously one night when Alex was a teenager he came home late partying and what he saw was....well, his parents dead bodies and one that gave it all away was bite marks on the neck, their bodies was an oddly blueish color their blood was right out their system. From since on he never trusted any of the vampires, but don't get me wrong he doesn't hate every single one of them just the ones who ticks him off or the evil ones who kills for fun. He's just not fond of them.