Hi Sky King
Everyone is not on the same page! A lot of us are very careful and try to let people know we are there, but if you pass 100 people, you might forget 3 or 4 times. Also, as a cyclist, i find that more and more people on foot have earbuds on so it gets very frustrating when no one will move because they can't hear me!
from what you are saying i am guessing you had both of your ears working for you, so back to the rider. Might be a clueless person, might be a distracted person. Hard to say but i am glad you are ok..