I am very pro cyclist and think I am a courteous driver but even I get really mad when I see cyclists riding two or three abreast on a busy country road. I was taught to "paint the white line" or close to it. I get mad when I see a cyclist 5 feet out from the roadway. It is dangerous and just plain rude. If the rider was focused he would be maintaining his line and no one would be endangered.
Whew. Thanks for letting me vent.