pathetic excuse

"Pathetic excuse for a human being" is used to describe someone who is so pathetic at what he does and what he believes in that he have no redeeming qualities, he is considered completely useless, he always complains about everything and never do anything to fix it, he feeds off attention and rage & complains when he doesn't get any, all he does is annoy and hurt the people around him, his ideas and morality are so pathetic so wrong so ridiculous that no one cares to listen, some people will even argue that he is not worth keeping alive but he is usually so pathetic that he is not even worth killing.