Over the last decade of cycling in the Middle Tennessee area, my companions and I have been cursed at, had objects thrown at us, had vehicles cut us off, endanger us in numerous ways, and generally act hostile toward us. That someone would do that dumbfounds me.
I have always been careful to block traffic as little as possible, and even when with a large group, we would go single file to reduce any inconvenience to motorists. Apparently, any action that impedes some motorists, even if only for a few seconds, is intolerable.