my far less eloquent take...

you know that voice in the back of your end that amps you up for your first day of a new job, or springs to life when you see someone doing something annoying like cutting in line, or fuels the anxiety in the back of your mind as you lay awake at night? that's just your inner voice, right?

well, really, a lot of people share inner voices. everyone has their own spin on it, and some people's inner voices are completely different than anyone else's (maybe schizophrenics? or prophets?), but generally there are shared components.

the collective aspects of these shared inner voices, if not culture, are at the very least what creates culture.

I wouldn't call those impulses an "inner voice". I'd call them learned behaviors beaten into people, and if anything we're thankfully finally seeing less of that.

If there's anything that immediately identifies someone as inexperienced and untrustworthy it's that impulsive behavior and over-reliance on "culture" instead of their own independent mind.