Bring with you a list of traffic laws that he has wrong... make sure you are citing actual code, and give a URL if possible. Then hand it to the guy. Tell him: "Study this, then we can talk."

I was amazed at the discussions that came my way when I posted the laws for cyclists outside of my cube... the majority of time I heard... "I didn't know... "

In spite of so many folks saying that so many motorists treat them well, I firmly believe that happens as some drivers are just being nice, but the majority of motorists DON'T KNOW THAT CYCLISTS ACTUALLY HAVE RIGHTS TO RIDE ON THE ROAD. Apparently that holds true for crosswalk guards too.

Beyond the basics learned in driver's ed, most drivers copy other drivers, and then assume they know the law.