Culture is more than "rules of interaction." Culture is made up of values, behaviours, modes of dress, language, roles... so many things. "Norms" is a better word for "rules of interaction" but it's also more than that.

I can't find the statement you're quoting about being vulnerable to narratives of our culture.

And there's no single over-arching culture that isn't disrupted by subcultures. So, your last statement is a puzzler. Patriarchal-capitalist-imperialist-heteronormative culture didn't create the ability for me to freely criticize it. Subcultural movements created that.

We always have to go to war with the dominant culture when it's oppressive. Power never volunteers to give itself up. Women's rights and civil rights were won through violence and force as much as by persuasion, if not more so.