I try to keep the green side out of it too.... I tell them that I'm an EE and I just like electric stuff and this is my hobby, just like having an ICE bike is theirs. Driving one of these ain't going to save the world, but its damned cool to ride past gas stations IMHO. My GF even comments about how stinky ICE bikes are and how she likes how mine doesn't smell up the garage, or stink when i start it up or while we're sitting in traffic. Also, don't have to worry about overheating in traffic jams like a Harley does with their air cooled cylinder heads.
They ask about range, I say it gets me wherever I want to go. It fits all of my needs. I don't tour, and don't care about long-ass trips.
They ask about noise, I say it sounds like a Tie Fighter.
They ask about charging, I say I refuel it while its sitting in the garage or at work.
They ask about acceleration, I challenge them to a race at a stoplight