It's a teasing, rug-pulling form of insult that attempts to steal someone's mojo, erase her cool, annihilate her effectiveness, and it appeals to a knowing audience that shares the contempt of the snarker and therefore understands whatever references he makes. It's all jeer and josh, a form of bullying that except at its highest levels beggars the soul of humor. Don't respond to anything unless it interferes with your ability to make a living or lead a happy social life.
100 points for the thundercats reference! at any rate, being snarky / sarcastic is frequently far more gentle than the things i would say if i was being completely honest.