Brother... I said I wouldn't fish there, let me repeat that, I wouldn't fish there.
I can do whatever I want if I don't want to fish the dock I don't have to? If you want to go ahead? But if a guy comes out and calmly asks you to stop fishing the dock and move along and you don't listen and continue to fish then that's on you.
If someone politely asks me to do something I'll do it even if I don't have too. Sometimes its just good manners, they may have had someone damage their dock so they are being more safe than sorry and asking all fishermen to stop fishing their dock.