He is a scum. 他是个下贱的人.
Some people are no better than animals 有些人禽兽不如. You are a sorry excuse for a human being. 你这个人渣. You are pathetic. 你无可救药.
What a creep! 多令人厌恶的爬虫! You're a lowlife. 你是个下流胚子.
You are in no position to talk. 你没资格说话.