I've encountered a few cottagers like that. I always show respect when fishing docks. If somebody is sitting on their dock I bypass it. Always do my best not to hit boats or the dock with lures. Definitely wouldn't leave a snagged hook in a dock or swim platform. But at they end of the day, I have a legal right to be on that water and to fish in it. If someone is a jerk about it I usually move on. No point ruining my day.