Where did you hear that China has mandated N95 masks? I live in Beijing and I can't say I've seen anyone wearing one. We basically have to wear the normal surgical masks when in shops, on public transport etc.
I've been living in Beijing for over ten years. So far I haven't heard anyone complain about it.
I know it's hard for Westerners to understand but most middle class Chinese are likely to see it as a good thing. The whole time I've been here I've read a constant stream of stories about fake food, fake medicine, fake milk-powder (which killed many babies), fake products, all types of fraud, etc. Add that to the general anti-social behaviors (such as spitting in the street) and you can see why many people recognize the need to "improve peoples' behavior" as Orwellian as that might sound to Western ears.
Middle-class urban Chinese also distinguish themselves from rural Chinese which they see as kind-of backwards. That's why there's little appetite for democracy ... nobody thinks those people should be voting.