subhuman

You got your regular human beings. Some may annoy you and you're indifferent about most. As long as they have morals that they believe in enough to behave as a safe member of society, they're human and you don't really notice them. Then you got the pedophiles, rapists, religious extremists and other cult leaders, hate-criminals, war lords, cannibals, the people who ruthlessly destroy lives for greed or fame, and the people who kill innocents just because free will permits them to and sometimes Internet Whores. Things that are so repulsive in nature that they aren't human, but they look like one and only behave as one in the most basic ways needed to survive (eating, sleeping, etc.). They are below the human status, most likely even below the animal kingdom. You notice these things because they do stuff that provoke the deepest black and red-colored emotions in you as long as you know that they are alive. The main thing to keep in mind is that at end of the day with regular humans, in all seriousness, you don't want to really kill the people who just get on your nerves or wish them the most miserable death imaginable that last ten thousand years. A subhuman is someone if you were to see them getting murdered in the worse way in an alley, you would act like you didn't see anything. Or even more, you might join in. If they're already dead. you'd party like it's 1999 on their grave mostly because you're disgusted that they were even graced with grave.