haetian
A haetian is a person who loves to hate you. They don't need a reason. They just want you to suffer.
My teacher is a haetian. She said I was a bad student just because I took a nap.
My best friend is a haetian. She said I was a bad friend just because I didn't show up to her party.
My cat is a haetian. It won't stop scratching my couch.