I don't sweat the small stuff, and I sure don't post about these things on FB. That was her big mistake, and will cause her neighbor to do these things more often to her. She likes to complain about her neighbors, publicly, and he likes to annoy them. This sitch just got much worse.
Yes, I too try to be considerate. Now and then, I need to release somehow, to let the kid ride up and down the street on his dirtbike so I can make a few calls or have a good cry, to mow early cuz I have to visit someone in the hospital, to play music loudly to drown out sorrow. We also must be more understanding of the why someone might seem to be acting inconsiderately. And to politely and privately point out to them how their actions have affected us.
There is no hope whatsoever for the music blaring idiots at the beach. Boy do they ever piss me off.