Ugh....I HATE getting the whole "Don't you feel unsafe in that thing?!" comment. My response to them now is "Do you ask that of everyone on a motorcycle?, 'cause I sure got more protection than them!". Then they just give you a blank stare and go "Yeah, I guess so..." lol :P
The comment I've gotten a couple of times was "I'd hate to get hit by a semi in that thing" to which I've responded by pointing out one would not likely be better off getting hit by a semi in any vehicle. And it is much safer than being on a bicycle or motorcycle.
How about "Semi Eater"? Everyone always asks what you will do if you get hit by a semi, even though any car that get hit by a semi is going to end up in the heap pile. People just don't stop and think.