I've have fished that Dock a many of times. I haven't had the experience you just had. But that maybe I can make it happen. I have a fellow on big inland that's is just like him. He comes out every time I fish his dock. The first time was wonderful experience. I had five 20 year old girls with me And this fellow came out yelling and screaming at us. I was like look man you don't own the water and I know there lots of fish under your dock and as long as we don't touch your dock I'm legal.

Just remember that he was wrong and you were right. You seem to of acted respectfully and moved on. He will not always be down there. So keep fishing that spot as normal. If he does that again you need to call law enforcement. They will explain to the owner of that dock is has no right to stand on.