"HATER"

A person that develops a strong dislike for another/ others solely based on their own opinion derived from personal judgement rather than objective merit. Hating, the result of being a hater is not exactly jealousy. The hater doesn't really want to be the person he or she hates, rather the hater wants to knock someone else down a notch. It can also be compared to the word troll. (inspired by unbandictionary.com)