It's also worth noting that human "cultures" behave remarkably like empirical clusters of loosely-correlated social norms, behaviors, signals, status rules, hierarchical systems, beliefs, and moral systems. This seems to strongly support most of what you've said here, and obviously there is some drift and some shared space between "cultures" depending on how you carve them.
It's also worth noting that human "cultures" behave remarkably like...
What you're describing is the definition of "culture" (more precisely, a definition of "culture", and a good one). I'm not sure why you're giving the weaker qualification of "behave remarkably like" rather than "are".
Here's the new thread for posting quotes, with the usual rules: