People who dislike themselves very much may refer to anyone they believe is a better person than they by some popular term, like "emo", and attempt to seem derogatory. Such words that are sometimes considered to be an insult are often not insulting at all, when understood. People are often called "nerd", in the same context. Do you think they really believe intelligence is a bad thing to possess, or are they just desperately, and unsuccessfully seeking to make their fears of being inept invalid by referring to that which they admire, but don't possess, as a negative quality, thus making the opposity quality, which is the truly undesirable one, good.
I don't know, I'm not a psychologist, nor a lexicographer. But I'm fairly sure their tactics of empowering their self by reversing the definitions of admirable and detestable usually end badly.