A person who is both an exaggerator and a hater.
Exaggerhaters have a tendency to blow things out of portion while simultaneously making a point of putting a person down or pointing out a flaw.
Exaggerhater: "Oh my God Becky, look at her butt. It is SO big. She looks like one of those rap guys girlfriends"
(The whole beginning of the song is an example by the way)