I then tried to point out other advantages such as being impossible to counterfeit, far more divisible than gold/paper/etc., and soon to be added 2-party escrow/multisig transactions. I don't think he really grasped the usefulness of each of those factors and I decided to stop pressing the issue so some other kid could ask about what school they should go to or something equally inane.
Well done. It is also important to not sound like a raving lunatic. Bitcoin doesn't need wide acceptance to muddy the waters until it is more useful. Each new innovation will enlighten more people.