I agree that the cyclist is a self righteous zealot. However, how can it be argued that he is holding up traffic when there is a lane available to pass him? And unless that lane he is in is over thirteen feet wide, he would be offering a dangerous invitation to same-lane passing if he hugged the fog line, which makes it impracticable to hug the side.

So, we agree that cyclists shouldn't have a big problem with riding as far to the right as is practicable, but you seem to be omitting the safety component of practicable; practicable is not the same as possible. We ride in the real world and I would think any cyclist with a reasonable amount of experience on the road would know the danger of inviting a close pass by hugging the right in a substandard width lane. (Using the common definition of substandard width lane being one in which it is not safe for a motor vehicle to pass a cyclist while both are entirely within the lane.)