But then you'd have unilateral coercive power over me. It needs to be a two-way street for either of us to be sure the other isn't a bad actor. I'll happily broadcast my entire (boring) existence so long as everyone else does the same. End the privacy arms race. It's exhausting and frankly immature.

It is the same when the authorities do it. They want to violate your privacy but they do not want you to violate theirs.

Including any secrets or confidential chats others have trusted them with.

I can promise to keep their information anonymous, just like the government never unreasonably 'unmasks' anyone.

The phrase doesn't mean, "I have nothing to hide from anyone at any time for any reason."

It means, "I have nothing to hide from authorities who are looking at my data in an official capacity, so I'm willing to cede my privacy to those particular actors in that specific context."

It might still be a bad argument, but your retort doesn't address it.

Do you have things to hide from people who are willing to misuse their official capacity?

I think the thing you're implying here is a much stronger line of attack, as I elaborate in this other comment: https://news.ycombinator.com/item?id=28119550

This is it. The people I talked with explained this to me exactly like this - they have nothing to hide from the authorities. Nor do they care that "someone in China" has access to things like the floor plan of their home. Baffling to me, but this is how they think, and if we plan to express our point, OP's aggressive line of "ok then let me rifle through your private stuff" won't work.