I don't really think nurture culture actually demands or implies people modelling each other mind well.

If they could make such a model it'd be never a problem to say "you are completely wrong" and make your partner understand it's not an offense.

I think it's quite the opposite, nurture culture reduces the cost of the possible misunderstanding so you have a lot of tries to explain and listen.

While at combat culture you can mistake real agression for discussion or look agressive to others if you didn't read the situation.