I would say that cultures interact in much the same way individuals do. In both cases there are things like exchange, mutual cooperation, conflict, argument, persuasion, and coercion.

True. What I would be saying, analogously, is that we have taken the "you-do-you while I-do-me" principle too far: if your friend decides to go out and rape someone, then you have a duty to forceably impose your values on them insofar as they shouldn't be doing that. Similarly, a society has a duty to take over or at least subjugate another society to their values when the latter gets too immoral.

Anti-imperialism is a very limited justification in the first place. But the disorderedness of a society is not in itself a sufficient reason for intervention. Should we intervene in North Korea out of compassion? Perhaps, but perhaps not. Compassion can be a motive, but it is seldom a sufficient condition for action.

Even if the negative consequences were very low (or non-existent), are you saying that the West would not be justified in taking over North Korea by force?

I agree that coercion should be the last resort, but it seems to be a resort; and seems to be a valid resort to stop societal structures that are really immoral; and this entails some version of imperialism, even if it is a much weaker version than the standard ones historically.

What I would be saying, analogously, is that we have taken the "you-do-you while I-do-me" principle too far: if your friend decides to go out and rape someone, then you have a duty to forceably impose your values on them insofar as they shouldn't be doing that. Similarly, a society has a duty to take over or at least subjugate another society to their values when the latter gets too immoral.

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and [coercion] seems to be a valid resort to stop societal structures that are really immoral; and this entails some version of imperialism — Bob Ross

Well, in virtue of what do we have a duty to prevent immorality? Do we have a duty to perpetrators? Do we have a duty to victims? Do we have a duty to "friends"? Do we have a duty to strangers? Do we have a duty to strangers on the other side of the world?

Even if the negative consequences were very low (or non-existent), are you saying that the West would not be justified in taking over North Korea by force? — Bob Ross

If there were no negative consequences then we would be justified. But even something as simple as resource allocation is a negative consequence, so there will always be negative consequences.