I've had a few incidences at one particular Tenn lake. An elderly couple happens to be lucky enough to have trees/brush out in front of their home/dock, though I'm doubtful "they" placed the brush there.
They will occasionally come down to the dock & bang/clang around, or fish, when we're in the area. They've never actually said anything to us, and in fact have never spoken to us, even when we casually speak a greeting to them.
Last time we were there, they had a warning siren/alarm that was aimed towards the lake ... that they'd turn on, in hopes of driving us off. We already knew about it, and were prepared for it ... we had ear plugs

And it isn't just us "out of staters" that have had similar reactions from these people ... the locals are the ones that told/showed us about the area & what to expect from these people. Most all of the other dock owners on this lake have been very friendly & accommodating ... even coming down to the dock to chat, fish, or just give us tips as to what the fish are biting on & when/where.

... cp