I fish docks at Pymy all the time without an issue. I don't do it in a tournament because it is usually prohibited in the rules because of the language in the permit.
On other lakes, I've had dock owners threaten to call the PAFBC on me for fishing their "property" and I, as nicely as possible, invite them to do so because they don't own the water around the dock. I inform them I pay my taxes and possess a valid fishing license so I am fishing legaly on public waters. They usually pretend to write down my boat registration number while I am smiling at them.
I've witnessed dock owners sitting on their docks with water hoses to discourage guys from fishing them. That can lead to an interesting "test of wills".
I've seen some docks that were "boobie trapped" with fishing line, nets, etc. strung under them to discourage guys from casting in there. That is usually a recipe for disaster and conflict.
The majority of time if a dock owner is in the vicinity of their dock, if I strike up a conversation before I start fishing it, I don't encounter any conflict.
Chug