To be sure, the spandex thing does not help. Couldn't agree, more. Even in my own family, I get teased about it even after explaining the actual benefits of bike specific clothing. With my friends that are just casual bike riders, the only thing I insist on when they ride with me is to be visible and wear a helmet. I'll supply a hit viz vest or pull over for them to wear if they don't have anything and always have an extra helmet on hand, too.