Jughead, PicHunter....welcome to Fish-Hawk and thanks for joining and posting.
I think you both hit the nail on the head really. We never do know what's on the other person's page and what experiences they have had. It is very true that we should not fish docks or even troll by too close when people are out enjoying their place...I can respect that and do, not that I have to, but because I think it's the right thing to do. I also think it's the right thing for the cottage owner to recognize that they don't own the water and to speak to fishermen with more respect and less tone.
If you do happen to get snagged on a dock, how many of us would just break off so that we could move along and not risk having the cottager come down and tear a strip of us. I personally would rather the angler get right on my dock and remove the hook out of the way. I do hear what is being said though about hooks in the water around the dock. It would only take one incident to cause a cottage owner to be outraged by a fisherman...and this becomes all fishermen.
I guess the only solution to this is for everyone to at least respect each other, no matter what. If the guy had told me he had a bad experience, instead of just starring at me and grunting some words every now and again...I would have apologized on behalf of all anglers and moved along, recognizing that I see his point and perhaps suggest that he put up a sign or something to the effect of "Anglers, please be careful not to leave hooks where my kids swim!"...or something like that...I don't know. It may discourage some people from fishing there, or at least have them be a little more careful when doing so....but then again....that may be opening up a whole new can of worms where eventually everyone has these signs and we won't be able to fish anywhere near docks or boats.
Hey, maybe I could sell those signs.....make a fortune...retire....and go fishing....near docks and shorelines.

hee hee (a little streak of evil coming out there I guess)
Thanks for the comments folks.