I usually get the 'oh, you're gone? No one noticed' type of comments now, but in middle school I ended up displaying the 'rip-their-throats-out' type of aggression MrMark mentioned to anyone that annoyed me. Being able to leave bloody streaks all up and down someone's torso with your nails because they would not keep their wretched hands to themselves and QUIT TOUCHING ME had its uses. Since people generally leave me alone without benefit of that reputation now that I'm in high school a different state (moved for unrelated reasons--I was doing fine in high school of the old state), I haven't felt the need to cultivate my old reputation.
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cogito, ergo sum.
non cogitas, ergo non es.