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Unless you live near the Arctic Circle these are quite rare to see. I thought I saw something similar from sunny Florida and it turned out to be regular cirrus clouds getting lit up by the sun.

Also, a 2D picture doesn't give you the depth information to see that these are really, really far away. Like I've seen meteor showers and have no doubt the altitude they are at. These cloud formations are about that height (50-100km)

I suspect they could mean they are rare in SF Bay or USA. Noctilucent clouds are not that uncommon in higher latitudes.

If you’d see them every day, once a day, you’d have to be 2739 years old.

I see them at least once or twice a year. Mammatus on the other hand...

Would love to see a proper, fully fledged Mammatus. Also a decent Asperatus.

—- are you saying they’re not rare - or you didn’t see them? - don’t understand this comment—-

I parsed that as "I'm pretty sure I saw them many times, so these particular clouds can't really be rare" + "it never occurred to me that some cloud types could be actually so rare to be news if you so see them".