I don't know - maybe because it is a personal interaction and they dealing with you face-to-face, but here in NJ the majority of attendants are quite considerate of bike riders: very often shake out the nozzle of accumulated spillage before handing it to me. Really, I never have an issue. With the cars, as others here wrote, I enjoy the fact that someone else is getting dirty. I do not enjoy filling up out of state, then driving with my hands reeking of gas. A lot of the self-service stations do not even have the courtesy of maintaining a paper towel dispenser.