I saw this when I lived in Indiana in the same town as Purdue University. Indiana's a no-helmet-law state, BTW. Sometimes I think I was the only biker in the state to wear a helmet. Mostly, I'd see college kids on sportbikes wearing the standard flip-flops, shorts, t-shirt...mirror shades for protection. usually popping wheelies in heavy traffic.
About monthly the local paper or tv news would have a story about a kid killed in a bike accident...always the same. "authorities say the student was travelling too fast, and would have lived had he been wearing a helmet."
Two things would bug me. A) popping wheelies right next to MY car, with MY kid in the backseat -- to each their own unless you're endangering MY family. B) getting sneered at by a pack of squids because I WAS wearing helmet, jacket, boots, pants, gloves, etc. Then again, I was sneering back...they just couldn't see it through the helmet.
I always hated when I was out riding, and a pack of these squids would be pulling their antics around me...and the cagers would automatically assume I was with them. Ick.