Your last three words, in hyphens, is exactly my point. It should matter no more to those advocating they should be able to drive or ride as slowly as they want, than it does to those who pass them.

I have no problem sharing the road with farm-equipment, bikes, horses, carriages, what-have-you, and respecting signs/markings that indicate no passing, or even prohibit just the passing of specific categories.

Fact is, those signs already exist and aren't in the places people in this thread are acting like such rules should be in-effect, so at what point is x passing you no longer offensive? Emergency vehicles? Busses? Car-pooling vehicles? Should you as a bike-rider be free to stop and inspect random cars to see if they hold enough passengers in that moment to be qualified to pass you?

You're right, it doesn't matter, there will always be slower and faster vehicles, and passing, no matter how much/many idiots label themselves "Vorhees" and ignore studies that show their claims versus passing vehicles amount to horse-shit, even when the scenario is setup to promote the idea.

Share the road means share the road, from both ends. As a bike-rider, I found nothing more frustrating than when a death-machine, shortly holding-up a row of death-machines, chose to pace me from behind and in-line with myself. Their following distance was almost never enough to have saved my life if I popped a tire or otherwise fell in a moment when they weren't paying perfect attention, and let's be real; Drivers don't use every-excuse to drive slowly when their vision, reflexes, and even attention-to-detail are top-notch.

The slow drivers are literally the last ones an even slower, more vulnerable, means of transport should want to share the road with, and pacing an even slower vehicle isn't "solidarity"; It's menace.