"Ride" is much more common, and certainly what the motorcyclists I know would say. The analogy is with riding a horse (i.e. sitting on it). See this explanation:
Just to clarify, this is the least effective way to get a message to "you guys" (the moderators), as this discussion forum is for the students to help each other. The most effective way is to click on the flag when your answer is marked as incorrect and select "My answer should have been accepted". As I understand it, that goes to the moderators. They can then add your answer, but it may take them a very long time to react because they are volunteers. Every so often they seem to get some free time and fix a bunch of these reports. It's probably a thankless task.
The people who created the course didn't come up with all possible alternative answers, and any that didn't occur to them get marked as incorrect. I don't think it's a sign of pedantry, just a sign that the course needed more beta-testing before it was released. Using the Report flag helps to fill that gap, bit by bit.