I have never seen "grids" lining the sky. I see real clouds all the time, except when the sky is clear blue. And the clouds I see are ordinary clouds like I've seen before. I'm old and have seen a lot, but never "grids."

I've seen posts on FB that say something like "Gee! I've never seen clouds like this before. What can it be?" And the photo is something I've seen before a lot, such as a buttermilk sky or mammatus clouds (precursor to tornadoes).

So many people look at the sky so seldom, they have no idea what's normal, and what isn't. They don't know what sun dogs are. They don't watch eclipses or meteor showers.