I had the same experience as blueskies a few months ago. An older man had his dog on a retractable leash, with the dog on one side of the trail and him on the other. I came up on them around a curve, slowly, and had to stop. I might have rung my bell. He started ranting that "you bike riders think you own the trail" and on and on.

I also didn't engage with him, just went on the grass and on my way, but I really wanted to tell him, "no, I don't think I own the trail, but I'd like to borrow just one little strip over here on the right if you don't mind."

I've got a retractable leash but haven't used it in about 11 years, since I saw how dangerous they are.