Same thing happened to me a decade ago up in Chiang Mai. Was having an early beer with some other residents at the condo’s cafe, when a small Thai dude stopped a woman on her motorbike, shouting at top of his lungs in middle of the soi.. I saw him raise his hand, but I turned my head a few seconds, and then he walked away, and she was crying her eyes out. I told my mate “at least he didn’t actually hit her”, to which he replied” you must not have watched the whole thing, he just cracked her twice as hard as he could”.
Back home there was no doubt some of us would have jumped in, but this is Thailand. It hurts to just watch a woman get smacked in public, but the far and has to mind his own business here.
About Jambo’s issue with the neighbours yelling, that would be my biggest fear about signing a year lease on a house, anywhere in the country. Say you have a dozen homes or more in your soi, it only takes one full of drunks and partiers to, in essence, ruin your life. And you can’t “rat them out” without risking problems down the line. That sucks