In a lifetime of riding since the early 70's, I have had the most problems with white males, 20's to 40's. This includes young, high school and college aged males in Jettas and Acuras (the apparent standard car of choice for this age group) who have far more hormones than grey cells. Close behind and gaining are white females. This group includes the young, aggressive "Honda Chicks", and the aforementioned suburban housewives, out and about with the SUV and the never-not-in-use cell phone.