sorry but that's the dumbest thing i've ever heard. dunno what your wearing but i have a red helmet sized up so i can wear a beanie under it. warm and i protect my thinker for $50. don't know what your life is worth but I damn well know mine is worth more than that.
But I can't call the kettle black. I only wore a helmet in the park until two years ago when I hit ice riding switch and woke up in the meatbasket. Ever since I ride and all of my friends have since gotten one. I am very pleased to see the majority of people even local park rats wearing em more. It's just dumb not to.