I rode in the MS150 a couple weekends ago with a group of people. Thousands of people ride in this event. We split up a bit during the actual ride, but there were a couple of people from my group that I stuck with most of the time. While riding, we would occasionally come upon people we didn't know, going a comfortable speed (for us), and start drafting them. Is it considered rude to do this without asking permission? I felt like asking them, but I thought it would get confusing if I started yelling at the person in front of me in the line.