No. Not often. One thing you have to remember about bicycle commuting is that you are more exposed to other people. Law of averages will dictate that you will have more interaction with people while on the bike than when in a car. So, since your interacting with other people more, in many different ways, chances are that you'll run into "nuts" now and then. Don't take what this guy did to heart. Just shrug it off and enjoy your riding!