anyone who wasn't pureblood was looked down upon in society besides the people known as "bloodtraitors" which pretty much caused the war which caused the property about Harry to be made which causes Voldemort to kill his parents but fail to kill Harry which causes Harry to get his scar and so on and so forth

Hard one, you can tell how much the vamps and wolves hated eachother but the death eaters were tring to kill off anything that wasnt of pure blood status.

I wouldn't really call the hatred between the shifters and the vampires "prejudiced." I mean, the wolves had pretty good reason to hate them, didn't they? Since (sans the Cullens) they killed people regularly. And the Cullens didn't hate the shifters until they decided to attack Nessie. The dislike Edward felt for Jacob was out of jealousy more than anything.