Things that are so obvious and ingrained that no one even thinks about them.
Here’s a few:
All US americans can go to Mexico EASILY. You’re supposed to have a passport but you don’t even need one (for car/foot crossing). Versus, it’s really hard for Mexicans, who aren’t wealthy, to secure a VISA to enter the US. I’m sure there are corollaries in other geo-regions.
Another one is wealthy countries having access to vaccines far ahead of “poor” countries.
In US, we might pay lip service to equal child-hood education but most of the funding pulls from local taxes so some kids might receive ~$10000 in spending while another receives $2000. I’m not looking it up at the moment, but I’m SURE there are strong racial stratas.
It's the little things like this that make me so thankful I got the parents I have. They've always split driving 50/50, or at least close enough that it never crossed my mind growing up that driving was the man's duty or whatever weird power trip some guys make it.
Edit: also along the same lines, whenever you see a (outwardly hetero) couple on a tandem bike it's almost always the man out in front with the woman staring at his back
My parents were divorced and both never dated or re-married, they sorta accomplished the same thing!