most of the people I work with are supportive, but I still get grief from a few folks. I tend to think it's because they think that I think I'm better than them because I ride. so, when they ask, I just say "for me, it's faster than driving from where I live, given the traffic." and they are usually cool with that.
there are a couple of folks who express sincere concern for my safety, especially as we get into winter. I tell them that I appreciate their concerns, and then I show them my array of lights and also explain that the reason I ride a folder is so I can just put it on the train in a downpour