I would have thought that a C ride would be no drop too, but who knows. "A" rides really don't work well with a no-drop rule, and many of the people that get dropped probably wouldn't want to be waited for anyway. I know I never did. Motivation for the next ride. And a point of pride when they couldn't drop me any more.
How did we get on passing etiquette? If someone passes me safely, I don't feel that I can ask much more than that.