Same here.

Probably 10 years ago I was cycling on a levee-top path with a center dividing line. A couple was walking in the right lane with their backs to me (no dog, no kids). Honestly, I get tired of yelling at people or disturbing the tranquility with my little bell unless really necessary. Most peds are tuned out with music anyway. They seemed dependable as I could see them for a full minute before catching up AND they respected the white dividing line the entire time. They never looked over their shoulders even once. So I chose to just pass silently. I moved all the way to the left edge of the opposing lane (likely 5 feet of space between us) and passed at about 15mph. The woman then yelled at me "Announce your pass!" to which I responded "Pay attention".

Some folks just waltz down the trail like there will never be another user encountered. I walk on the same trail. I keep my head on a swivel. It is really not that hard to pay attention and not get startled every time someone passes. It is really not my responsibility to yell at everyone on that path. Sometimes it is courteous to do so, sometimes it is absolutely necessary, and other times there is no harm in just silently gliding by IMO. No posted rules about that on the trail either.