> I’m guessing some law (law-abiding) gives you the right to bother people who are using their own feet instead of wheels because you want to pass them and they should have to actively watch out for you and yield to you? Okay, that part is fine. But I don’t see how it is nice or, I dunno, ethical.

No. There are just people who will walk on a designated bicycle lane because they haven't seen the signage, are ignorant or careless about it, or will just cross it to get somewhere else. All while wearing ANC headphones. This isn't about bothering someone, but warning them. It's really no different from someone jaywalking without seeing you, and honking to make them aware of that. Or are you supposing you'd just break and wait until they're finished crossing the street?