I don't get trail etiquette.
I understand that horses get the right of way, seeing that the rider is on an uncontrollable (if the horse wants to jump off that cliff, you're going with it) animal.
In my opinion it should then be bicyclists who are next in the pecking order. We are on bikes that are almost completely controllable, but try stopping for hikers while coming around a corner, going downhill.
Then should be hikers, walkers, jogger etc. they are COMPLETELY in control of themselves and therefore can easily get to safety, stop on a dime or step aside if a horse or bike comes down the trail.
Just a thought. I never got it and maybe I never will.