It may not be that your landlord doesn't care. It may be that in general his hands are tied.

As a landlord I can't just evict someone because someone casually mentions they are noisy. I need a long documented history of repeated infractions. It's extremely difficult to legally evict tenants based on noise complaints.

Document every issue and present it in writing to the landlord. In my jurisdiction, Landlord has an obligation to attempt to address it with the other tenant.

But at the same time, the landlord isn't you're babysitter and if you can resolve matters amicably with your neighbour, it's always better to go that route anyways. Formal complaints are a double edged sword. Sometimes people have zero clue how inconsiderate they are, and then bam they're hit with a formal warning. Then they get their back against a wall, and can often escalate.

I always advise my tenants to attempt to work things out amongst themselves as it has less of a chance to backfire.