This guy has been around for a long time, He is very nice, When on the trail he yields all the time. His dog is well trained and gets out of the way. Ive had nothing but good encounters with him. Looking at that it seems like a dick move on you. NO reason for that at all. Why not just slow down and go wide to the left? his dog wasnt in your way , he wasnt in your way.
You are on a populated , heavily used path , learn to share