When someone says they've got nothing to hide, the worst counter-argument you can give is "try going to the bathroom with the door open". It is easy to deflect and completely misses the point.
They're actually right: they do not have anything to hide. The ones who do are journalists, whistle-blowers, persecuted minorities, etc.
And if those are the only ones taking privacy-preserving measures, that fact alone will be a red flag.
My favorite illustration of this is the scene from the Great Escape where the escapees are on a train platform and would surely escape into the crowd, but the SS blow whistles and all the civilians lay down
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