Okay first off I sympathize with you a lot. Home should be comfy and safe and peaceful.
Practical thoughts. If another neighbor has already confronted the resident directly then I would say the noisy guy would suspect that neighbor. But it doesn't matter. This has to stop even if it means you get involved. But I don't doubt for a moment that there are several others who are resenting this noise too. That's inconsiderate and obnoxious and shouldn't be tolerated. The way I see this playing out is the new neighbor will tone it down or be forced to move. There will be no retribution.
Hope this helps ease your anxiety. I understand... really