Though I don't think this should have ended up in court, I think you're a little off. I think we could agree that if you can’t listen to music in your own house, this isn’t a free country. But what about the person who plays it at 300 decibels?
Again, the point is made ~ it was her house, not his, and he went outside to see if he could hear it.
This story isn’t about music, and I doubt you can tell me the decibel level of the woman’s cursing. This nosy cop came down the street to listen to the woman, then shouted into her house for her to “watch her language”. If he’d done that to me, I’d have had a few choice words for him myself.