I dunno cuz there can also be the hating-on-a-personal-level sort of hate, OR cuz your on like red team and they're on blue teram or whaterever.
also the stronger hate, and the more reasonable is the jhate on a personal level.
also Im getting off subject lolz I always do =P
um but I think sometimes.
some vamps/werewolves think they're supposed to be mortal enemies, and some probably just don't fucking care
it depends on which vampires and which werewolves but it is usually more like two rival sports teams where they don't hate eachother (they are not enemies) they are just rivals, trying to be better ect. then the other.